1221032111010 has 64 divisors (see below), whose sum is σ = 2940477517440. Its totient is φ = 324499230720.

The previous prime is 1221032110943. The next prime is 1221032111023. The reversal of 1221032111010 is 101112301221.

It is a super-2 number, since 2×1221032111010² (a number of 25 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10740546 + ... + 10853634.

It is an arithmetic number, because the mean of its divisors is an integer number (45944961210).

Almost surely, 2^{1221032111010} is an apocalyptic number.

1221032111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221032111010 is an abundant number, since it is smaller than the sum of its proper divisors (1719445406430).

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

1221032111010 is a wasteful number, since it uses less digits than its factorization.

1221032111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114323.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1221032111010 its reverse (101112301221), we get a palindrome (1322144412231).

The spelling of 1221032111010 in words is "one trillion, two hundred twenty-one billion, thirty-two million, one hundred eleven thousand, ten".