21246164316 has 36 divisors (see below), whose sum is σ = 57836781912. Its totient is φ = 6537281184.

The previous prime is 21246164311. The next prime is 21246164339. The reversal of 21246164316 is 61346164212.

21246164316 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 6 + 1 + 643 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246164311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22698426 + ... + 22699361.

Almost surely, 2^21246164316 is an apocalyptic number.

21246164316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21246164316 is an abundant number, since it is smaller than the sum of its proper divisors (36590617596).

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

21246164316 is a wasteful number, since it uses less digits than its factorization.

21246164316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45397810 (or 45397805 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 21246164316 in words is "twenty-one billion, two hundred forty-six million, one hundred sixty-four thousand, three hundred sixteen".