21237074225 has 24 divisors (see below), whose sum is σ = 26779651320. Its totient is φ = 16703608320.

The previous prime is 21237074171. The next prime is 21237074321. The reversal of 21237074225 is 52247073212.

It can be written as a sum of positive squares in 12 ways, for example, as 10939695649 + 10297378576 = 104593^2 + 101476^2 .

It is not a de Polignac number, because 21237074225 - 2²⁶ = 21169965361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560171 + ... + 596879.

It is an arithmetic number, because the mean of its divisors is an integer number (1115818805).

Almost surely, 2^21237074225 is an apocalyptic number.

21237074225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21237074225 is a deficient number, since it is larger than the sum of its proper divisors (5542577095).

21237074225 is a wasteful number, since it uses less digits than its factorization.

21237074225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37109 (or 37104 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 35.

The spelling of 21237074225 in words is "twenty-one billion, two hundred thirty-seven million, seventy-four thousand, two hundred twenty-five".