121221011010 has 64 divisors (see below), whose sum is σ = 318154988160. Its totient is φ = 29315028480.

The previous prime is 121221010979. The next prime is 121221011059. The reversal of 121221011010 is 10110122121.

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, 314097 + ... + 584036.

It is an arithmetic number, because the mean of its divisors is an integer number (4971171690).

Almost surely, 2^121221011010 is an apocalyptic number.

121221011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221011010 is an abundant number, since it is smaller than the sum of its proper divisors (196933977150).

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

121221011010 is a wasteful number, since it uses less digits than its factorization.

121221011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898563.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121221011010 its reverse (10110122121), we get a palindrome (131331133131).

Subtracting from 121221011010 its reverse (10110122121), we obtain a square (111110888889 = 333333²).

The spelling of 121221011010 in words is "one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, ten".