21431220339 has 16 divisors (see below), whose sum is σ = 29278253312. Its totient is φ = 13936714848.

The previous prime is 21431220337. The next prime is 21431220367. The reversal of 21431220339 is 93302213412.

It is not a de Polignac number, because 21431220339 - 2¹ = 21431220337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431220337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12079 + ... + 207384.

It is an arithmetic number, because the mean of its divisors is an integer number (1829890832).

Almost surely, 2^21431220339 is an apocalyptic number.

21431220339 is a deficient number, since it is larger than the sum of its proper divisors (7847032973).

21431220339 is a wasteful number, since it uses less digits than its factorization.

21431220339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220266.

The product of its (nonzero) digits is 7776, while the sum is 30.

The spelling of 21431220339 in words is "twenty-one billion, four hundred thirty-one million, two hundred twenty thousand, three hundred thirty-nine".