21210643331796 has 48 divisors (see below), whose sum is σ = 49652603239680. Its totient is φ = 7047204328320.

The previous prime is 21210643331711. The next prime is 21210643331803. The reversal of 21210643331796 is 69713334601212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38370406 + ... + 38919266.

It is an arithmetic number, because the mean of its divisors is an integer number (1034429234160).

Almost surely, 2^{21210643331796} is an apocalyptic number.

It is an amenable number.

21210643331796 is an abundant number, since it is smaller than the sum of its proper divisors (28441959907884).

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

21210643331796 is a wasteful number, since it uses less digits than its factorization.

21210643331796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559344 (or 559342 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 21210643331796 in words is "twenty-one trillion, two hundred ten billion, six hundred forty-three million, three hundred thirty-one thousand, seven hundred ninety-six".