21168053312 has 168 divisors, whose sum is σ = 51224322240. Its totient is φ = 8637404160.

The previous prime is 21168053293. The next prime is 21168053327. The reversal of 21168053312 is 21335086112.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19401887 + ... + 19402977.

It is an arithmetic number, because the mean of its divisors is an integer number (304906680).

Almost surely, 2^21168053312 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 21168053312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25612161120).

21168053312 is an abundant number, since it is smaller than the sum of its proper divisors (30056268928).

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

21168053312 is a wasteful number, since it uses less digits than its factorization.

21168053312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21168053312 in words is "twenty-one billion, one hundred sixty-eight million, fifty-three thousand, three hundred twelve".