201101021220 has 96 divisors (see below), whose sum is σ = 620354318976. Its totient is φ = 48269056000.

The previous prime is 201101021183. The next prime is 201101021221. The reversal of 201101021220 is 22120101102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 201101021196 and 201101021205.

It is not an unprimeable number, because it can be changed into a prime (201101021221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1441749 + ... + 1575068.

It is an arithmetic number, because the mean of its divisors is an integer number (6462024156).

Almost surely, 2^201101021220 is an apocalyptic number.

201101021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201101021220 is an abundant number, since it is smaller than the sum of its proper divisors (419253297756).

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

201101021220 is a wasteful number, since it uses less digits than its factorization.

201101021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016941 (or 3016939 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201101021220 its reverse (22120101102), we get a palindrome (223221122322).

The spelling of 201101021220 in words is "two hundred one billion, one hundred one million, twenty-one thousand, two hundred twenty".