21064331839 has 8 divisors (see below), whose sum is σ = 21227750640. Its totient is φ = 20901053376.

The previous prime is 21064331809. The next prime is 21064331851. The reversal of 21064331839 is 93813346012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21064331839 - 2⁷ = 21064331711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064331809) 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, 276972 + ... + 344734.

It is an arithmetic number, because the mean of its divisors is an integer number (2653468830).

Almost surely, 2^21064331839 is an apocalyptic number.

21064331839 is a deficient number, since it is larger than the sum of its proper divisors (163418801).

21064331839 is a wasteful number, since it uses less digits than its factorization.

21064331839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70169.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 21064331839 in words is "twenty-one billion, sixty-four million, three hundred thirty-one thousand, eight hundred thirty-nine".