21646660236484 has 12 divisors (see below), whose sum is σ = 38047077491500. Its totient is φ = 10776066667488.

The previous prime is 21646660236463. The next prime is 21646660236503. The reversal of 21646660236484 is 48463206664612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21026626830400 + 620033406084 = 4585480^2 + 787422^2 .

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11815861659 + ... + 11815863490.

Almost surely, 2^{21646660236484} is an apocalyptic number.

It is an amenable number.

21646660236484 is a deficient number, since it is larger than the sum of its proper divisors (16400417255016).

21646660236484 is a wasteful number, since it uses less digits than its factorization.

21646660236484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23631725382 (or 23631725380 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 58.

The spelling of 21646660236484 in words is "twenty-one trillion, six hundred forty-six billion, six hundred sixty million, two hundred thirty-six thousand, four hundred eighty-four".