21312120000 has 140 divisors (see below), whose sum is σ = 70463238296. Its totient is φ = 5683200000.

The previous prime is 21312119993. The next prime is 21312120029. The reversal of 21312120000 is 2121312.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31200 + ... + 208800.

Almost surely, 2^21312120000 is an apocalyptic number.

21312120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35231619148).

21312120000 is an abundant number, since it is smaller than the sum of its proper divisors (49151118296).

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

21312120000 is an equidigital number, since it uses as much as digits as its factorization.

21312120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177636 (or 177611 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21312120000 its reverse (2121312), we get a palindrome (21314241312).

The spelling of 21312120000 in words is "twenty-one billion, three hundred twelve million, one hundred twenty thousand".