1001010121220 has 24 divisors (see below), whose sum is σ = 2102229869208. Its totient is φ = 400383360000.

The previous prime is 1001010121211. The next prime is 1001010121303. The reversal of 1001010121220 is 221210101001.

It can be written as a sum of positive squares in 4 ways, for example, as 398433638656 + 602576482564 = 631216^2 + 776258^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893261 + ... + 1673300.

It is an arithmetic number, because the mean of its divisors is an integer number (87592911217).

Almost surely, 2^{1001010121220} is an apocalyptic number.

1001010121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001010121220 is an abundant number, since it is smaller than the sum of its proper divisors (1101219747988).

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

1001010121220 is a wasteful number, since it uses less digits than its factorization.

1001010121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586071 (or 2586069 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001010121220 its reverse (221210101001), we get a palindrome (1222220222221).

The spelling of 1001010121220 in words is "one trillion, one billion, ten million, one hundred twenty-one thousand, two hundred twenty".