21321011320312 has 32 divisors (see below), whose sum is σ = 43611427572480. Its totient is φ = 9691309214560.

The previous prime is 21321011320247. The next prime is 21321011320339. The reversal of 21321011320312 is 21302311012312.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 15707823 + ... + 17011105.

It is an arithmetic number, because the mean of its divisors is an integer number (1362857111640).

Almost surely, 2^{21321011320312} is an apocalyptic number.

21321011320312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21321011320312 is an abundant number, since it is smaller than the sum of its proper divisors (22290416252168).

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

21321011320312 is a wasteful number, since it uses less digits than its factorization.

21321011320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489203 (or 1489199 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21321011320312 its reverse (21302311012312), we get a palindrome (42623322332624).

The spelling of 21321011320312 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, three hundred twenty thousand, three hundred twelve".