21312133101312 has 72 divisors (see below), whose sum is σ = 56722370943504. Its totient is φ = 7103917031424.

The previous prime is 21312133101289. The next prime is 21312133101349. The reversal of 21312133101312 is 21310133121312.

It is a super-2 number, since 2×21312133101312² (a number of 27 digits) contains 22 as substring.

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

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, 48960658 + ... + 49394030.

Almost surely, 2^{21312133101312} is an apocalyptic number.

It is an amenable number.

21312133101312 is an abundant number, since it is smaller than the sum of its proper divisors (35410237842192).

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

21312133101312 is an equidigital number, since it uses as much as digits as its factorization.

21312133101312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497425 (or 497411 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21312133101312 its reverse (21310133121312), we get a palindrome (42622266222624).

The spelling of 21312133101312 in words is "twenty-one trillion, three hundred twelve billion, one hundred thirty-three million, one hundred one thousand, three hundred twelve".