21174667472 has 60 divisors (see below), whose sum is σ = 47176162080. Its totient is φ = 9019186368.

The previous prime is 21174667469. The next prime is 21174667489. The reversal of 21174667472 is 27476647112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3120179 + ... + 3126957.

It is an arithmetic number, because the mean of its divisors is an integer number (786269368).

Almost surely, 2^21174667472 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 21174667472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23588081040).

21174667472 is an abundant number, since it is smaller than the sum of its proper divisors (26001494608).

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

21174667472 is an equidigital number, since it uses as much as digits as its factorization.

21174667472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128 (or 6955 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The spelling of 21174667472 in words is "twenty-one billion, one hundred seventy-four million, six hundred sixty-seven thousand, four hundred seventy-two".