21525223652 has 48 divisors (see below), whose sum is σ = 40220893440. Its totient is φ = 10050367392.

The previous prime is 21525223651. The next prime is 21525223661. The reversal of 21525223652 is 25632252512.

It is not an unprimeable number, because it can be changed into a prime (21525223651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2942183 + ... + 2949489.

It is an arithmetic number, because the mean of its divisors is an integer number (837935280).

Almost surely, 2^21525223652 is an apocalyptic number.

It is an amenable number.

21525223652 is a deficient number, since it is larger than the sum of its proper divisors (18695669788).

21525223652 is a wasteful number, since it uses less digits than its factorization.

21525223652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7880 (or 7878 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The spelling of 21525223652 in words is "twenty-one billion, five hundred twenty-five million, two hundred twenty-three thousand, six hundred fifty-two".