21250722525 has 24 divisors (see below), whose sum is σ = 35138881920. Its totient is φ = 11332314240.

The previous prime is 21250722503. The next prime is 21250722527. The reversal of 21250722525 is 52522705212.

It is not a de Polignac number, because 21250722525 - 2⁷ = 21250722397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250722527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 931404 + ... + 953946.

It is an arithmetic number, because the mean of its divisors is an integer number (1464120080).

Almost surely, 2^21250722525 is an apocalyptic number.

21250722525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21250722525 is a deficient number, since it is larger than the sum of its proper divisors (13888159395).

21250722525 is a wasteful number, since it uses less digits than its factorization.

21250722525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35125 (or 35120 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 33.

The spelling of 21250722525 in words is "twenty-one billion, two hundred fifty million, seven hundred twenty-two thousand, five hundred twenty-five".