21320309982 has 16 divisors (see below), whose sum is σ = 44884863360. Its totient is φ = 6732729432.

The previous prime is 21320309981. The next prime is 21320310017. The reversal of 21320309982 is 28990302312.

It is a self number, because there is not a number n which added to its sum of digits gives 21320309982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320309981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93510018 + ... + 93510245.

It is an arithmetic number, because the mean of its divisors is an integer number (2805303960).

Almost surely, 2^21320309982 is an apocalyptic number.

21320309982 is an abundant number, since it is smaller than the sum of its proper divisors (23564553378).

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

21320309982 is a wasteful number, since it uses less digits than its factorization.

21320309982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187020287.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21320309982 in words is "twenty-one billion, three hundred twenty million, three hundred nine thousand, nine hundred eighty-two".