21002332554 has 24 divisors (see below), whose sum is σ = 52005776160. Its totient is φ = 6000666408.

The previous prime is 21002332517. The next prime is 21002332609. The reversal of 21002332554 is 45523320012.

It is a happy number.

21002332554 is a `hidden beast` number, since 2 + 100 + 2 + 3 + 3 + 2 + 554 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83342464 + ... + 83342715.

It is an arithmetic number, because the mean of its divisors is an integer number (2166907340).

Almost surely, 2^21002332554 is an apocalyptic number.

21002332554 is an abundant number, since it is smaller than the sum of its proper divisors (31003443606).

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

21002332554 is a wasteful number, since it uses less digits than its factorization.

21002332554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166685194 (or 166685191 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21002332554 its reverse (45523320012), we get a palindrome (66525652566).

The spelling of 21002332554 in words is "twenty-one billion, two million, three hundred thirty-two thousand, five hundred fifty-four".