21896412488 has 32 divisors (see below), whose sum is σ = 44066329560. Its totient is φ = 10163036160.

The previous prime is 21896412449. The next prime is 21896412493. The reversal of 21896412488 is 88421469812.

It can be written as a sum of positive squares in 4 ways, for example, as 21134762884 + 761649604 = 145378^2 + 27598^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1092833 + ... + 1112688.

Almost surely, 2^21896412488 is an apocalyptic number.

It is an amenable number.

21896412488 is an abundant number, since it is smaller than the sum of its proper divisors (22169917072).

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

21896412488 is a wasteful number, since it uses less digits than its factorization.

21896412488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205617 (or 2205613 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 53.

The spelling of 21896412488 in words is "twenty-one billion, eight hundred ninety-six million, four hundred twelve thousand, four hundred eighty-eight".