21311472000 has 1536 divisors, whose sum is σ = 95995186560. Its totient is φ = 4128768000.

The previous prime is 21311471977. The next prime is 21311472011. The reversal of 21311472000 is 27411312.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 519791980 + ... + 519792020.

Almost surely, 2^21311472000 is an apocalyptic number.

21311472000 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 21311472000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47997593280).

21311472000 is an abundant number, since it is smaller than the sum of its proper divisors (74683714560).

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

21311472000 is a wasteful number, since it uses less digits than its factorization.

21311472000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

Adding to 21311472000 its reverse (27411312), we get a palindrome (21338883312).

The spelling of 21311472000 in words is "twenty-one billion, three hundred eleven million, four hundred seventy-two thousand".