21164255484 has 96 divisors (see below), whose sum is σ = 51740392704. Its totient is φ = 6727795200.

The previous prime is 21164255461. The next prime is 21164255491. The reversal of 21164255484 is 48455246112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3801687 + ... + 3807249.

It is an arithmetic number, because the mean of its divisors is an integer number (538962424).

Almost surely, 2^21164255484 is an apocalyptic number.

It is an amenable number.

21164255484 is an abundant number, since it is smaller than the sum of its proper divisors (30576137220).

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

21164255484 is a wasteful number, since it uses less digits than its factorization.

21164255484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787 (or 5785 counting only the distinct ones).

The product of its digits is 307200, while the sum is 42.

The spelling of 21164255484 in words is "twenty-one billion, one hundred sixty-four million, two hundred fifty-five thousand, four hundred eighty-four".