21675252415 has 4 divisors (see below), whose sum is σ = 26010302904. Its totient is φ = 17340201928.

The previous prime is 21675252373. The next prime is 21675252451. The reversal of 21675252415 is 51425257612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21675252415 - 2²⁷ = 21541034687 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167525237 + ... + 2167525246.

It is an arithmetic number, because the mean of its divisors is an integer number (6502575726).

Almost surely, 2^21675252415 is an apocalyptic number.

21675252415 is a deficient number, since it is larger than the sum of its proper divisors (4335050489).

21675252415 is an equidigital number, since it uses as much as digits as its factorization.

21675252415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335050488.

The product of its digits is 168000, while the sum is 40.

The spelling of 21675252415 in words is "twenty-one billion, six hundred seventy-five million, two hundred fifty-two thousand, four hundred fifteen".