21620610460457 has 16 divisors (see below), whose sum is σ = 23919289414272. Its totient is φ = 19438366590720.

The previous prime is 21620610460451. The next prime is 21620610460481. The reversal of 21620610460457 is 75406401602612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21620610460457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620610460451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36226919 + ... + 36818892.

It is an arithmetic number, because the mean of its divisors is an integer number (1494955588392).

Almost surely, 2^{21620610460457} is an apocalyptic number.

It is an amenable number.

21620610460457 is a deficient number, since it is larger than the sum of its proper divisors (2298678953815).

21620610460457 is a wasteful number, since it uses less digits than its factorization.

21620610460457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73046608.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 21620610460457 in words is "twenty-one trillion, six hundred twenty billion, six hundred ten million, four hundred sixty thousand, four hundred fifty-seven".