21252245274 has 24 divisors (see below), whose sum is σ = 49588572852. Its totient is φ = 6539152320.

The previous prime is 21252245263. The next prime is 21252245279. The reversal of 21252245274 is 47254225212.

21252245274 is a `hidden beast` number, since 2 + 12 + 522 + 4 + 52 + 74 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17026335225 + 4225910049 = 130485^2 + 65007^2 .

It is not an unprimeable number, because it can be changed into a prime (21252245279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45410547 + ... + 45411014.

Almost surely, 2^21252245274 is an apocalyptic number.

21252245274 is an abundant number, since it is smaller than the sum of its proper divisors (28336327578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21252245274 is a wasteful number, since it uses less digits than its factorization.

21252245274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90821582 (or 90821579 counting only the distinct ones).

The product of its digits is 89600, while the sum is 36.

The spelling of 21252245274 in words is "twenty-one billion, two hundred fifty-two million, two hundred forty-five thousand, two hundred seventy-four".