1056153021621 has 32 divisors (see below), whose sum is σ = 1447257250560. Its totient is φ = 684861004800.

The previous prime is 1056153021613. The next prime is 1056153021673. The reversal of 1056153021621 is 1261203516501.

It is not a de Polignac number, because 1056153021621 - 2³ = 1056153021613 is a prime.

It is a super-2 number, since 2×1056153021621² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056153021601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9019911 + ... + 9136251.

It is an arithmetic number, because the mean of its divisors is an integer number (45226789080).

Almost surely, 2^{1056153021621} is an apocalyptic number.

It is an amenable number.

1056153021621 is a deficient number, since it is larger than the sum of its proper divisors (391104228939).

1056153021621 is a wasteful number, since it uses less digits than its factorization.

1056153021621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116957.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 1056153021621 in words is "one trillion, fifty-six billion, one hundred fifty-three million, twenty-one thousand, six hundred twenty-one".