121221220210120 has 64 divisors (see below), whose sum is σ = 292859219779200. Its totient is φ = 44993460341760.

The previous prime is 121221220210117. The next prime is 121221220210169. The reversal of 121221220210120 is 21012022122121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1255349610 + ... + 1255446169.

It is an arithmetic number, because the mean of its divisors is an integer number (4575925309050).

Almost surely, 2^{121221220210120} is an apocalyptic number.

121221220210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221220210120 is an abundant number, since it is smaller than the sum of its proper divisors (171637999569080).

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

121221220210120 is a wasteful number, since it uses less digits than its factorization.

121221220210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510795878 (or 2510795874 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221220210120 its reverse (21012022122121), we get a palindrome (142233242332241).

The spelling of 121221220210120 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty".