12921920355 has 32 divisors (see below), whose sum is σ = 20848299264. Its totient is φ = 6834139776.

The previous prime is 12921920261. The next prime is 12921920399. The reversal of 12921920355 is 55302912921.

It is not a de Polignac number, because 12921920355 - 2¹³ = 12921912163 is a prime.

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, 1136157 + ... + 1147473.

It is an arithmetic number, because the mean of its divisors is an integer number (651509352).

Almost surely, 2^12921920355 is an apocalyptic number.

12921920355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12921920355 is a deficient number, since it is larger than the sum of its proper divisors (7926378909).

12921920355 is a wasteful number, since it uses less digits than its factorization.

12921920355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11955.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 12921920355 in words is "twelve billion, nine hundred twenty-one million, nine hundred twenty thousand, three hundred fifty-five".