21745675137464 has 32 divisors (see below), whose sum is σ = 41455861643280. Its totient is φ = 10692206613504.

The previous prime is 21745675137397. The next prime is 21745675137469. The reversal of 21745675137464 is 46473157654712.

It is a junction number, because it is equal to n+sod(n) for n = 21745675137397 and 21745675137406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745675137469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89122682 + ... + 89366345.

Almost surely, 2^{21745675137464} is an apocalyptic number.

It is an amenable number.

21745675137464 is a deficient number, since it is larger than the sum of its proper divisors (19710186505816).

21745675137464 is a wasteful number, since it uses less digits than its factorization.

21745675137464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178489287 (or 178489283 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 62.

The spelling of 21745675137464 in words is "twenty-one trillion, seven hundred forty-five billion, six hundred seventy-five million, one hundred thirty-seven thousand, four hundred sixty-four".