21120656016145 has 8 divisors (see below), whose sum is σ = 28965471107904. Its totient is φ = 14482735553904.

The previous prime is 21120656016113. The next prime is 21120656016151. The reversal of 21120656016145 is 54161065602112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120656016145 - 2⁵ = 21120656016113 is a prime.

It is a super-2 number, since 2×21120656016145² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120656016098 and 21120656016107.

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, 301723657339 + ... + 301723657408.

It is an arithmetic number, because the mean of its divisors is an integer number (3620683888488).

Almost surely, 2^{21120656016145} is an apocalyptic number.

It is an amenable number.

21120656016145 is a deficient number, since it is larger than the sum of its proper divisors (7844815091759).

21120656016145 is an equidigital number, since it uses as much as digits as its factorization.

21120656016145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603447314759.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 21120656016145 in words is "twenty-one trillion, one hundred twenty billion, six hundred fifty-six million, sixteen thousand, one hundred forty-five".