21213320239 has 8 divisors (see below), whose sum is σ = 22745482560. Its totient is φ = 19712749056.

The previous prime is 21213320237. The next prime is 21213320291. The reversal of 21213320239 is 93202331212.

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 21213320239 - 2¹ = 21213320237 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 (21213320237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7896394 + ... + 7899079.

It is an arithmetic number, because the mean of its divisors is an integer number (2843185320).

Almost surely, 2^21213320239 is an apocalyptic number.

21213320239 is a deficient number, since it is larger than the sum of its proper divisors (1532162321).

21213320239 is a wasteful number, since it uses less digits than its factorization.

21213320239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15795569.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21213320239 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred thirty-nine".