21874693653 has 8 divisors (see below), whose sum is σ = 32406953600. Its totient is φ = 14583129084.

The previous prime is 21874693637. The next prime is 21874693681. The reversal of 21874693653 is 35639647812.

21874693653 is a `hidden beast` number, since 21 + 87 + 469 + 36 + 53 = 666.

It is not a de Polignac number, because 21874693653 - 2⁴ = 21874693637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21874693653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874695653) 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, 405086893 + ... + 405086946.

It is an arithmetic number, because the mean of its divisors is an integer number (4050869200).

Almost surely, 2^21874693653 is an apocalyptic number.

It is an amenable number.

21874693653 is a deficient number, since it is larger than the sum of its proper divisors (10532259947).

21874693653 is an equidigital number, since it uses as much as digits as its factorization.

21874693653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810173848 (or 810173842 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 21874693653 in words is "twenty-one billion, eight hundred seventy-four million, six hundred ninety-three thousand, six hundred fifty-three".