21893568839 has 2 divisors, whose sum is σ = 21893568840. Its totient is φ = 21893568838.

The previous prime is 21893568797. The next prime is 21893568887. The reversal of 21893568839 is 93886539812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21893568839 - 2³² = 17598601543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21893568899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946784419 + 10946784420.

It is an arithmetic number, because the mean of its divisors is an integer number (10946784420).

Almost surely, 2^21893568839 is an apocalyptic number.

21893568839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893568839 is an equidigital number, since it uses as much as digits as its factorization.

21893568839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22394880, while the sum is 62.

The spelling of 21893568839 in words is "twenty-one billion, eight hundred ninety-three million, five hundred sixty-eight thousand, eight hundred thirty-nine".