21323120719 has 2 divisors, whose sum is σ = 21323120720. Its totient is φ = 21323120718.

The previous prime is 21323120713. The next prime is 21323120737. The reversal of 21323120719 is 91702132312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323120719 - 2⁷ = 21323120591 is a prime.

It is a super-2 number, since 2×21323120719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323120713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661560359 + 10661560360.

It is an arithmetic number, because the mean of its divisors is an integer number (10661560360).

Almost surely, 2^21323120719 is an apocalyptic number.

21323120719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323120719 is an equidigital number, since it uses as much as digits as its factorization.

21323120719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 21323120719 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, seven hundred nineteen".