2156121424464 has 80 divisors (see below), whose sum is σ = 6366379989888. Its totient is φ = 615968096256.

The previous prime is 2156121424351. The next prime is 2156121424489. The reversal of 2156121424464 is 4644241216512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 2808504 + ... + 3492840.

Almost surely, 2^{2156121424464} is an apocalyptic number.

2156121424464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2156121424464 is an abundant number, since it is smaller than the sum of its proper divisors (4210258565424).

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

2156121424464 is a wasteful number, since it uses less digits than its factorization.

2156121424464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693732 (or 693726 counting only the distinct ones).

The product of its digits is 368640, while the sum is 42.

The spelling of 2156121424464 in words is "two trillion, one hundred fifty-six billion, one hundred twenty-one million, four hundred twenty-four thousand, four hundred sixty-four".