21123335013504 has 64 divisors (see below), whose sum is σ = 56422316124000. Its totient is φ = 7001775828992.

The previous prime is 21123335013401. The next prime is 21123335013523. The reversal of 21123335013504 is 40531053332112.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153586809 + ... + 153724280.

Almost surely, 2^{21123335013504} is an apocalyptic number.

21123335013504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21123335013504 is an abundant number, since it is smaller than the sum of its proper divisors (35298981110496).

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

21123335013504 is a wasteful number, since it uses less digits than its factorization.

21123335013504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307311285 (or 307311273 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21123335013504 its reverse (40531053332112), we get a palindrome (61654388345616).

The spelling of 21123335013504 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirty-five million, thirteen thousand, five hundred four".