21312699912 has 576 divisors, whose sum is σ = 74823091200. Its totient is φ = 5555329920.

The previous prime is 21312699899. The next prime is 21312699943. The reversal of 21312699912 is 21999621312.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 300178837 + ... + 300178907.

It is an arithmetic number, because the mean of its divisors is an integer number (129901200).

Almost surely, 2^21312699912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312699912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37411545600).

21312699912 is an abundant number, since it is smaller than the sum of its proper divisors (53510391288).

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

21312699912 is an equidigital number, since it uses as much as digits as its factorization.

21312699912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 145 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The spelling of 21312699912 in words is "twenty-one billion, three hundred twelve million, six hundred ninety-nine thousand, nine hundred twelve".