21551432203344 has 40 divisors (see below), whose sum is σ = 56080916663040. Its totient is φ = 7131374157568.

The previous prime is 21551432203267. The next prime is 21551432203363. The reversal of 21551432203344 is 44330223415512.

It is a happy number.

It is a congruent number.

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, 1638636384 + ... + 1638649535.

It is an arithmetic number, because the mean of its divisors is an integer number (1402022916576).

Almost surely, 2^{21551432203344} is an apocalyptic number.

21551432203344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21551432203344 is an abundant number, since it is smaller than the sum of its proper divisors (34529484459696).

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

21551432203344 is a wasteful number, since it uses less digits than its factorization.

21551432203344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277286067 (or 3277286061 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21551432203344 its reverse (44330223415512), we get a palindrome (65881655618856).

The spelling of 21551432203344 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred thirty-two million, two hundred three thousand, three hundred forty-four".