21522523501 has 8 divisors (see below), whose sum is σ = 21586743360. Its totient is φ = 21458371392.

The previous prime is 21522523459. The next prime is 21522523511. The reversal of 21522523501 is 10532522512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21522523501 - 2¹⁵ = 21522490733 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 21522523501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522523511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659106 + ... + 690988.

It is an arithmetic number, because the mean of its divisors is an integer number (2698342920).

Almost surely, 2^21522523501 is an apocalyptic number.

It is an amenable number.

21522523501 is a deficient number, since it is larger than the sum of its proper divisors (64219859).

21522523501 is a wasteful number, since it uses less digits than its factorization.

21522523501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33875.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 21522523501 in words is "twenty-one billion, five hundred twenty-two million, five hundred twenty-three thousand, five hundred one".