21316971312 has 160 divisors (see below), whose sum is σ = 75307957760. Its totient is φ = 5622048000.

The previous prime is 21316971311. The next prime is 21316971329. The reversal of 21316971312 is 21317961312.

21316971312 is a `hidden beast` number, since 21 + 316 + 9 + 7 + 1 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is not an unprimeable number, because it can be changed into a prime (21316971311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231814 + ... + 310437.

It is an arithmetic number, because the mean of its divisors is an integer number (470674736).

Almost surely, 2^21316971312 is an apocalyptic number.

It is an amenable number.

21316971312 is an abundant number, since it is smaller than the sum of its proper divisors (53990986448).

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

21316971312 is a wasteful number, since it uses less digits than its factorization.

21316971312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542288 (or 542276 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The spelling of 21316971312 in words is "twenty-one billion, three hundred sixteen million, nine hundred seventy-one thousand, three hundred twelve".