21210200312320 has 40 divisors (see below), whose sum is σ = 50854769348724. Its totient is φ = 8484080123904.

The previous prime is 21210200312311. The next prime is 21210200312347. The reversal of 21210200312320 is 2321300201212.

It can be written as a sum of positive squares in 2 ways, for example, as 20993551024384 + 216649287936 = 4581872^2 + 465456^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4142614689 + ... + 4142619808.

Almost surely, 2^{21210200312320} is an apocalyptic number.

21210200312320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210200312320 is an abundant number, since it is smaller than the sum of its proper divisors (29644569036404).

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

21210200312320 is an frugal number, since it uses more digits than its factorization.

21210200312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285234520 (or 8285234504 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210200312320 its reverse (2321300201212), we get a palindrome (23531500513532).

The spelling of 21210200312320 in words is "twenty-one trillion, two hundred ten billion, two hundred million, three hundred twelve thousand, three hundred twenty".