21681069122239 has 4 divisors (see below), whose sum is σ = 21690632895624. Its totient is φ = 21671505348856.

The previous prime is 21681069122227. The next prime is 21681069122257. The reversal of 21681069122239 is 93222196018612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21681069122239 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 (21681069182239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4781883292 + ... + 4781887825.

It is an arithmetic number, because the mean of its divisors is an integer number (5422658223906).

Almost surely, 2^{21681069122239} is an apocalyptic number.

21681069122239 is a deficient number, since it is larger than the sum of its proper divisors (9563773385).

21681069122239 is an equidigital number, since it uses as much as digits as its factorization.

21681069122239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9563773384.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 21681069122239 in words is "twenty-one trillion, six hundred eighty-one billion, sixty-nine million, one hundred twenty-two thousand, two hundred thirty-nine".