21442401239 has 4 divisors (see below), whose sum is σ = 24505601424. Its totient is φ = 18379201056.

The previous prime is 21442401187. The next prime is 21442401247. The reversal of 21442401239 is 93210424412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21442401239 - 2²⁴ = 21425624023 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 (21442401289) 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, 1531600082 + ... + 1531600095.

It is an arithmetic number, because the mean of its divisors is an integer number (6126400356).

Almost surely, 2^21442401239 is an apocalyptic number.

21442401239 is a deficient number, since it is larger than the sum of its proper divisors (3063200185).

21442401239 is an equidigital number, since it uses as much as digits as its factorization.

21442401239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063200184.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21442401239 in words is "twenty-one billion, four hundred forty-two million, four hundred one thousand, two hundred thirty-nine".