21121004103432 has 64 divisors (see below), whose sum is σ = 53403541593600. Its totient is φ = 6960479869440.

The previous prime is 21121004103421. The next prime is 21121004103503. The reversal of 21121004103432 is 23430140012112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7637944 + ... + 10028967.

It is an arithmetic number, because the mean of its divisors is an integer number (834430337400).

Almost surely, 2^{21121004103432} is an apocalyptic number.

It is an amenable number.

21121004103432 is an abundant number, since it is smaller than the sum of its proper divisors (32282537490168).

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

21121004103432 is a wasteful number, since it uses less digits than its factorization.

21121004103432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17667486 (or 17667482 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21121004103432 its reverse (23430140012112), we get a palindrome (44551144115544).

The spelling of 21121004103432 in words is "twenty-one trillion, one hundred twenty-one billion, four million, one hundred three thousand, four hundred thirty-two".