129121922120 has 64 divisors (see below), whose sum is σ = 292193568000. Its totient is φ = 51352392960.

The previous prime is 129121922119. The next prime is 129121922201. The reversal of 129121922120 is 21229121921.

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, 12898157 + ... + 12908163.

It is an arithmetic number, because the mean of its divisors is an integer number (4565524500).

Almost surely, 2^129121922120 is an apocalyptic number.

129121922120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129121922120 is an abundant number, since it is smaller than the sum of its proper divisors (163071645880).

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

129121922120 is a wasteful number, since it uses less digits than its factorization.

129121922120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11838 (or 11834 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 129121922120 in words is "one hundred twenty-nine billion, one hundred twenty-one million, nine hundred twenty-two thousand, one hundred twenty".