21115910448 has 30 divisors (see below), whose sum is σ = 59095222004. Its totient is φ = 7038636768.

The previous prime is 21115910437. The next prime is 21115910513. The reversal of 21115910448 is 84401951112.

21115910448 is a `hidden beast` number, since 21 + 1 + 1 + 591 + 0 + 4 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73318990 + ... + 73319277.

Almost surely, 2^21115910448 is an apocalyptic number.

It is an amenable number.

21115910448 is an abundant number, since it is smaller than the sum of its proper divisors (37979311556).

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

21115910448 is a wasteful number, since it uses less digits than its factorization.

21115910448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146638281 (or 146638272 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 21115910448 in words is "twenty-one billion, one hundred fifteen million, nine hundred ten thousand, four hundred forty-eight".