21242521500 has 48 divisors (see below), whose sum is σ = 61858226976. Its totient is φ = 5664672000.

The previous prime is 21242521463. The next prime is 21242521501. The reversal of 21242521500 is 512524212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242521501) 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, 7079341 + ... + 7082340.

It is an arithmetic number, because the mean of its divisors is an integer number (1288713062).

Almost surely, 2^21242521500 is an apocalyptic number.

21242521500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242521500 is an abundant number, since it is smaller than the sum of its proper divisors (40615705476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21242521500 is a wasteful number, since it uses less digits than its factorization.

21242521500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14161703 (or 14161691 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 21242521500 in words is "twenty-one billion, two hundred forty-two million, five hundred twenty-one thousand, five hundred".