121221122120010 has 80 divisors (see below), whose sum is σ = 355581958244832. Its totient is φ = 29386938693600.

The previous prime is 121221122119931. The next prime is 121221122120023. The reversal of 121221122120010 is 10021221122121.

121221122120010 is a `hidden beast` number, since 1 + 21 + 2 + 211 + 221 + 200 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6802523196 + ... + 6802541015.

Almost surely, 2^{121221122120010} is an apocalyptic number.

121221122120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221122120010 is an abundant number, since it is smaller than the sum of its proper divisors (234360836124822).

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

121221122120010 is a wasteful number, since it uses less digits than its factorization.

121221122120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13605064241 (or 13605064232 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221122120010 its reverse (10021221122121), we get a palindrome (131242343242131).

The spelling of 121221122120010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, ten".