2156005228920 has 32 divisors (see below), whose sum is σ = 6468015687120. Its totient is φ = 574934727680.

The previous prime is 2156005228849. The next prime is 2156005228931. The reversal of 2156005228920 is 298225006512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8983355001 + ... + 8983355240.

Almost surely, 2^{2156005228920} is an apocalyptic number.

2156005228920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156005228920 is an abundant number, since it is smaller than the sum of its proper divisors (4312010458200).

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

2156005228920 is a wasteful number, since it uses less digits than its factorization.

2156005228920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17966710255 (or 17966710251 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 2156005228920 in words is "two trillion, one hundred fifty-six billion, five million, two hundred twenty-eight thousand, nine hundred twenty".