21138276776484 has 48 divisors (see below), whose sum is σ = 56497140761600. Its totient is φ = 6025750219296.

The previous prime is 21138276776479. The next prime is 21138276776521. The reversal of 21138276776484 is 48467767283112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286576054 + ... + 286649805.

Almost surely, 2^{21138276776484} is an apocalyptic number.

It is an amenable number.

21138276776484 is an abundant number, since it is smaller than the sum of its proper divisors (35358863985116).

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

21138276776484 is a wasteful number, since it uses less digits than its factorization.

21138276776484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573226312 (or 573226310 counting only the distinct ones).

The product of its digits is 151732224, while the sum is 66.

The spelling of 21138276776484 in words is "twenty-one trillion, one hundred thirty-eight billion, two hundred seventy-six million, seven hundred seventy-six thousand, four hundred eighty-four".