21382870938 has 32 divisors (see below), whose sum is σ = 50242272192. Its totient is φ = 5981222400.

The previous prime is 21382870931. The next prime is 21382870939. The reversal of 21382870938 is 83907828312.

It is not an unprimeable number, because it can be changed into a prime (21382870931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12460023 + ... + 12461738.

It is an arithmetic number, because the mean of its divisors is an integer number (1570071006).

Almost surely, 2^21382870938 is an apocalyptic number.

21382870938 is an abundant number, since it is smaller than the sum of its proper divisors (28859401254).

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

21382870938 is a wasteful number, since it uses less digits than its factorization.

21382870938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24921790.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 21382870938 in words is "twenty-one billion, three hundred eighty-two million, eight hundred seventy thousand, nine hundred thirty-eight".