21675036897 has 6 divisors (see below), whose sum is σ = 31308386642. Its totient is φ = 14450024592.

The previous prime is 21675036893. The next prime is 21675036899. The reversal of 21675036897 is 79863057612.

It can be written as a sum of positive squares in only one way, i.e., 15446512656 + 6228524241 = 124284^2 + 78921^2 .

It is not a de Polignac number, because 21675036897 - 2² = 21675036893 is a prime.

It is a super-2 number, since 2×21675036897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21675036893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1204168708 + ... + 1204168725.

Almost surely, 2^21675036897 is an apocalyptic number.

It is an amenable number.

21675036897 is a deficient number, since it is larger than the sum of its proper divisors (9633349745).

21675036897 is a wasteful number, since it uses less digits than its factorization.

21675036897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408337439 (or 2408337436 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 21675036897 in words is "twenty-one billion, six hundred seventy-five million, thirty-six thousand, eight hundred ninety-seven".