21579316201 has 9 divisors (see below), whose sum is σ = 21898114903. Its totient is φ = 21265099240.

The previous prime is 21579316127. The next prime is 21579316217. The reversal of 21579316201 is 10261397512.

The square root of 21579316201 is 146899.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3381306201 + 18198010000 = 58149^2 + 134900^2 .

It is not a de Polignac number, because 21579316201 - 2²⁷ = 21445098473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21579316261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10428795 + ... + 10430863.

Almost surely, 2^21579316201 is an apocalyptic number.

21579316201 is the 146899-th square number.

21579316201 is the 73450-th centered octagonal number.

It is an amenable number.

21579316201 is a deficient number, since it is larger than the sum of its proper divisors (318798702).

21579316201 is an frugal number, since it uses more digits than its factorization.

21579316201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280 (or 2140 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21579316201 in words is "twenty-one billion, five hundred seventy-nine million, three hundred sixteen thousand, two hundred one".