21524501253 has 16 divisors (see below), whose sum is σ = 30427174400. Its totient is φ = 13496615280.

The previous prime is 21524501233. The next prime is 21524501269. The reversal of 21524501253 is 35210542512.

It is not a de Polignac number, because 21524501253 - 2¹³ = 21524493061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21524501253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524501233) 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, 1350433 + ... + 1366278.

It is an arithmetic number, because the mean of its divisors is an integer number (1901698400).

Almost surely, 2^21524501253 is an apocalyptic number.

It is an amenable number.

21524501253 is a deficient number, since it is larger than the sum of its proper divisors (8902673147).

21524501253 is a wasteful number, since it uses less digits than its factorization.

21524501253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716872.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21524501253 in words is "twenty-one billion, five hundred twenty-four million, five hundred one thousand, two hundred fifty-three".