21439980316 has 12 divisors (see below), whose sum is σ = 37521144360. Its totient is φ = 10719653360.

The previous prime is 21439980293. The next prime is 21439980319. The reversal of 21439980316 is 61308993412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439980319) 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 3 ways as a sum of consecutive naturals, for example, 107550 + ... + 233338.

It is an arithmetic number, because the mean of its divisors is an integer number (3126762030).

Almost surely, 2^21439980316 is an apocalyptic number.

It is an amenable number.

21439980316 is a deficient number, since it is larger than the sum of its proper divisors (16081164044).

21439980316 is a wasteful number, since it uses less digits than its factorization.

21439980316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168404 (or 168402 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 21439980316 in words is "twenty-one billion, four hundred thirty-nine million, nine hundred eighty thousand, three hundred sixteen".