21939992895719 has 2 divisors, whose sum is σ = 21939992895720. Its totient is φ = 21939992895718.

The previous prime is 21939992895713. The next prime is 21939992895757. The reversal of 21939992895719 is 91759829993912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21939992895719 - 2⁸ = 21939992895463 is a prime.

It is a super-2 number, since 2×21939992895719² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21939992895713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10969996447859 + 10969996447860.

It is an arithmetic number, because the mean of its divisors is an integer number (10969996447860).

Almost surely, 2^{21939992895719} is an apocalyptic number.

21939992895719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21939992895719 is an equidigital number, since it uses as much as digits as its factorization.

21939992895719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1785641760, while the sum is 83.

The spelling of 21939992895719 in words is "twenty-one trillion, nine hundred thirty-nine billion, nine hundred ninety-two million, eight hundred ninety-five thousand, seven hundred nineteen".