21525253444 has 12 divisors (see below), whose sum is σ = 39651782800. Its totient is φ = 10196172648.

The previous prime is 21525253439. The next prime is 21525253469. The reversal of 21525253444 is 44435252512.

It is a super-2 number, since 2×21525253444² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141613434 + ... + 141613585.

Almost surely, 2^21525253444 is an apocalyptic number.

It is an amenable number.

21525253444 is a deficient number, since it is larger than the sum of its proper divisors (18126529356).

21525253444 is a wasteful number, since it uses less digits than its factorization.

21525253444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283227042 (or 283227040 counting only the distinct ones).

The product of its digits is 192000, while the sum is 37.

The spelling of 21525253444 in words is "twenty-one billion, five hundred twenty-five million, two hundred fifty-three thousand, four hundred forty-four".