21132015244 has 6 divisors (see below), whose sum is σ = 36981026684. Its totient is φ = 10566007620.

The previous prime is 21132015167. The next prime is 21132015277. The reversal of 21132015244 is 44251023112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641501902 + ... + 2641501909.

Almost surely, 2^21132015244 is an apocalyptic number.

It is an amenable number.

21132015244 is a deficient number, since it is larger than the sum of its proper divisors (15849011440).

21132015244 is a wasteful number, since it uses less digits than its factorization.

21132015244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283003815 (or 5283003813 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21132015244 its reverse (44251023112), we get a palindrome (65383038356).

The spelling of 21132015244 in words is "twenty-one billion, one hundred thirty-two million, fifteen thousand, two hundred forty-four".