21237074253 has 12 divisors (see below), whose sum is σ = 30678167520. Its totient is φ = 14156944776.

The previous prime is 21237074171. The next prime is 21237074321. The reversal of 21237074253 is 35247073212.

21237074253 is a `hidden beast` number, since 212 + 370 + 74 + 2 + 5 + 3 = 666.

It is not a de Polignac number, because 21237074253 - 2⁸ = 21237073997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237074653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39600 + ... + 209862.

It is an arithmetic number, because the mean of its divisors is an integer number (2556513960).

Almost surely, 2^21237074253 is an apocalyptic number.

It is an amenable number.

21237074253 is a deficient number, since it is larger than the sum of its proper divisors (9441093267).

21237074253 is a wasteful number, since it uses less digits than its factorization.

21237074253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184128 (or 184125 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The spelling of 21237074253 in words is "twenty-one billion, two hundred thirty-seven million, seventy-four thousand, two hundred fifty-three".