21386891484 has 48 divisors (see below), whose sum is σ = 63368569600. Its totient is φ = 6110540208.

The previous prime is 21386891483. The next prime is 21386891509. The reversal of 21386891484 is 48419868312.

It is a happy number.

21386891484 is a `hidden beast` number, since 2 + 1 + 3 + 86 + 89 + 1 + 484 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21386891484.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21386891483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14144014 + ... + 14145525.

Almost surely, 2^21386891484 is an apocalyptic number.

It is an amenable number.

21386891484 is an abundant number, since it is smaller than the sum of its proper divisors (41981678116).

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

21386891484 is a wasteful number, since it uses less digits than its factorization.

21386891484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28289559 (or 28289551 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The spelling of 21386891484 in words is "twenty-one billion, three hundred eighty-six million, eight hundred ninety-one thousand, four hundred eighty-four".