21167072344 has 64 divisors (see below), whose sum is σ = 44135280000. Its totient is φ = 9436638720.

The previous prime is 21167072323. The next prime is 21167072411. The reversal of 21167072344 is 44327076112.

It is a super-2 number, since 2×21167072344² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004832 + ... + 1025680.

It is an arithmetic number, because the mean of its divisors is an integer number (689613750).

Almost surely, 2^21167072344 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 21167072344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22067640000).

21167072344 is an abundant number, since it is smaller than the sum of its proper divisors (22968207656).

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

21167072344 is a wasteful number, since it uses less digits than its factorization.

21167072344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21088 (or 21084 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 21167072344 in words is "twenty-one billion, one hundred sixty-seven million, seventy-two thousand, three hundred forty-four".