21526245053 has 6 divisors (see below), whose sum is σ = 22866980346. Its totient is φ = 20259995072.

The previous prime is 21526245023. The next prime is 21526245067. The reversal of 21526245053 is 35054262512.

It can be written as a sum of positive squares in 3 ways, for example, as 12252940249 + 9273304804 = 110693^2 + 96298^2 .

It is not a de Polignac number, because 21526245053 - 2⁶ = 21526244989 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 (21526245023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37242350 + ... + 37242927.

It is an arithmetic number, because the mean of its divisors is an integer number (3811163391).

Almost surely, 2^21526245053 is an apocalyptic number.

It is an amenable number.

21526245053 is a deficient number, since it is larger than the sum of its proper divisors (1340735293).

21526245053 is an equidigital number, since it uses as much as digits as its factorization.

21526245053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74485311 (or 74485294 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21526245053 in words is "twenty-one billion, five hundred twenty-six million, two hundred forty-five thousand, fifty-three".