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2001221012220 = 2235432835694817
BaseRepresentation
bin11101000111110010000…
…100010100101011111100
321002022111112101200211220
4131013302010110223330
5230242000034342340
64131203115313340
7264404056636323
oct35076204245374
97068445350756
102001221012220
117017930a93a1
12283a24a4b850
13116939504901
146cc06acd0ba
15370ca2b8ed0
hex1d1f2114afc

2001221012220 has 192 divisors, whose sum is σ = 5765300513280. Its totient is φ = 518385917952.

The previous prime is 2001221012209. The next prime is 2001221012291. The reversal of 2001221012220 is 222101221002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2001221012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 415447252 + ... + 415452068.

It is an arithmetic number, because the mean of its divisors is an integer number (30027606840).

Almost surely, 22001221012220 is an apocalyptic number.

2001221012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001221012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2882650256640).

2001221012220 is an abundant number, since it is smaller than the sum of its proper divisors (3764079501060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001221012220 is a wasteful number, since it uses less digits than its factorization.

2001221012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001221012220 its reverse (222101221002), we get a palindrome (2223322233222).

The spelling of 2001221012220 in words is "two trillion, one billion, two hundred twenty-one million, twelve thousand, two hundred twenty".