21423387084 has 24 divisors (see below), whose sum is σ = 54532258368. Its totient is φ = 6491935440.

The previous prime is 21423387077. The next prime is 21423387113. The reversal of 21423387084 is 48078332412.

It is a happy number.

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, 81149062 + ... + 81149325.

It is an arithmetic number, because the mean of its divisors is an integer number (2272177432).

Almost surely, 2^21423387084 is an apocalyptic number.

It is an amenable number.

21423387084 is an abundant number, since it is smaller than the sum of its proper divisors (33108871284).

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

21423387084 is a wasteful number, since it uses less digits than its factorization.

21423387084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162298405 (or 162298403 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 21423387084 in words is "twenty-one billion, four hundred twenty-three million, three hundred eighty-seven thousand, eighty-four".