21357452613 has 16 divisors (see below), whose sum is σ = 33424277120. Its totient is φ = 11874413376.

The previous prime is 21357452593. The next prime is 21357452617. The reversal of 21357452613 is 31625475312.

It is not a de Polignac number, because 21357452613 - 2⁵ = 21357452581 is a prime.

It is a super-2 number, since 2×21357452613² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357452617) 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, 13742758 + ... + 13744311.

It is an arithmetic number, because the mean of its divisors is an integer number (2089017320).

Almost surely, 2^21357452613 is an apocalyptic number.

It is an amenable number.

21357452613 is a deficient number, since it is larger than the sum of its proper divisors (12066824507).

21357452613 is a wasteful number, since it uses less digits than its factorization.

21357452613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27487116.

The product of its digits is 151200, while the sum is 39.

The spelling of 21357452613 in words is "twenty-one billion, three hundred fifty-seven million, four hundred fifty-two thousand, six hundred thirteen".