21872630807 has 4 divisors (see below), whose sum is σ = 21881463576. Its totient is φ = 21863798040.

The previous prime is 21872630789. The next prime is 21872630839. The reversal of 21872630807 is 70803627812.

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 21872630807 - 2²⁸ = 21604195351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872630887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4412669 + ... + 4417622.

It is an arithmetic number, because the mean of its divisors is an integer number (5470365894).

Almost surely, 2^21872630807 is an apocalyptic number.

21872630807 is a deficient number, since it is larger than the sum of its proper divisors (8832769).

21872630807 is an equidigital number, since it uses as much as digits as its factorization.

21872630807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832768.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 21872630807 in words is "twenty-one billion, eight hundred seventy-two million, six hundred thirty thousand, eight hundred seven".