21225725524 has 24 divisors (see below), whose sum is σ = 37296161280. Its totient is φ = 10569769056.

The previous prime is 21225725471. The next prime is 21225725537. The reversal of 21225725524 is 42552752212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980829 + ... + 1002235.

It is an arithmetic number, because the mean of its divisors is an integer number (1554006720).

Almost surely, 2^21225725524 is an apocalyptic number.

It is an amenable number.

21225725524 is a deficient number, since it is larger than the sum of its proper divisors (16070435756).

21225725524 is a wasteful number, since it uses less digits than its factorization.

21225725524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22407 (or 22405 counting only the distinct ones).

The product of its digits is 112000, while the sum is 37.

The spelling of 21225725524 in words is "twenty-one billion, two hundred twenty-five million, seven hundred twenty-five thousand, five hundred twenty-four".