21239731325819 has 8 divisors (see below), whose sum is σ = 21761070962400. Its totient is φ = 20718548708800.

The previous prime is 21239731325783. The next prime is 21239731325849. The reversal of 21239731325819 is 91852313793212.

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 21239731325819 - 2⁸ = 21239731325563 is a prime.

It is a super-2 number, since 2×21239731325819² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21239731325849) 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, 38981012 + ... + 39522129.

It is an arithmetic number, because the mean of its divisors is an integer number (2720133870300).

Almost surely, 2^{21239731325819} is an apocalyptic number.

21239731325819 is a deficient number, since it is larger than the sum of its proper divisors (521339636581).

21239731325819 is an equidigital number, since it uses as much as digits as its factorization.

21239731325819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78509781.

The product of its digits is 4898880, while the sum is 56.

The spelling of 21239731325819 in words is "twenty-one trillion, two hundred thirty-nine billion, seven hundred thirty-one million, three hundred twenty-five thousand, eight hundred nineteen".