21550427243807 has 64 divisors (see below), whose sum is σ = 27348411138048. Its totient is φ = 16495079328000.

The previous prime is 21550427243797. The next prime is 21550427243861. The reversal of 21550427243807 is 70834272405512.

It is not a de Polignac number, because 21550427243807 - 2⁶ = 21550427243743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550427243407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3664412507 + ... + 3664418387.

It is an arithmetic number, because the mean of its divisors is an integer number (427318924032).

Almost surely, 2^{21550427243807} is an apocalyptic number.

21550427243807 is a deficient number, since it is larger than the sum of its proper divisors (5797983894241).

21550427243807 is a wasteful number, since it uses less digits than its factorization.

21550427243807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9660.

The product of its (nonzero) digits is 3763200, while the sum is 50.

The spelling of 21550427243807 in words is "twenty-one trillion, five hundred fifty billion, four hundred twenty-seven million, two hundred forty-three thousand, eight hundred seven".