2156121533560 has 32 divisors (see below), whose sum is σ = 4912681982400. Its totient is φ = 851531541120.

The previous prime is 2156121533549. The next prime is 2156121533581. The reversal of 2156121533560 is 653351216512.

It is a happy number.

It is a super-2 number, since 2×2156121533560² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 341155311 + ... + 341161630.

It is an arithmetic number, because the mean of its divisors is an integer number (153521311950).

Almost surely, 2^{2156121533560} is an apocalyptic number.

2156121533560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156121533560 is an abundant number, since it is smaller than the sum of its proper divisors (2756560448840).

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

2156121533560 is a wasteful number, since it uses less digits than its factorization.

2156121533560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682317031 (or 682317027 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 2156121533560 in words is "two trillion, one hundred fifty-six billion, one hundred twenty-one million, five hundred thirty-three thousand, five hundred sixty".