10215621081 has 24 divisors (see below), whose sum is σ = 14802518016. Its totient is φ = 6788937600.

The previous prime is 10215621043. The next prime is 10215621121. The reversal of 10215621081 is 18012651201.

10215621081 is a `hidden beast` number, since 1 + 0 + 21 + 562 + 1 + 0 + 81 = 666.

It is not a de Polignac number, because 10215621081 - 2⁷ = 10215620953 is a prime.

It is a super-2 number, since 2×10215621081² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10215621041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6142056 + ... + 6143718.

It is an arithmetic number, because the mean of its divisors is an integer number (616771584).

Almost surely, 2^10215621081 is an apocalyptic number.

It is an amenable number.

10215621081 is a deficient number, since it is larger than the sum of its proper divisors (4586896935).

10215621081 is a wasteful number, since it uses less digits than its factorization.

10215621081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413 (or 3410 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The spelling of 10215621081 in words is "ten billion, two hundred fifteen million, six hundred twenty-one thousand, eighty-one".