21137479176 has 256 divisors, whose sum is σ = 64509696000. Its totient is φ = 5688299520.

The previous prime is 21137479163. The next prime is 21137479189. The reversal of 21137479176 is 67197473112.

It is an interprime number because it is at equal distance from previous prime (21137479163) and next prime (21137479189).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41527210 + ... + 41527718.

It is an arithmetic number, because the mean of its divisors is an integer number (251991000).

Almost surely, 2^21137479176 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 21137479176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32254848000).

21137479176 is an abundant number, since it is smaller than the sum of its proper divisors (43372216824).

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

21137479176 is a wasteful number, since it uses less digits than its factorization.

21137479176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1048 counting only the distinct ones).

The product of its digits is 444528, while the sum is 48.

The spelling of 21137479176 in words is "twenty-one billion, one hundred thirty-seven million, four hundred seventy-nine thousand, one hundred seventy-six".