21940943719 has 2 divisors, whose sum is σ = 21940943720. Its totient is φ = 21940943718.

The previous prime is 21940943711. The next prime is 21940943807. The reversal of 21940943719 is 91734904912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21940943719 - 2³ = 21940943711 is a prime.

It is a super-2 number, since 2×21940943719² (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 (21940943711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10970471859 + 10970471860.

It is an arithmetic number, because the mean of its divisors is an integer number (10970471860).

Almost surely, 2^21940943719 is an apocalyptic number.

21940943719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21940943719 is an equidigital number, since it uses as much as digits as its factorization.

21940943719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 21940943719 in words is "twenty-one billion, nine hundred forty million, nine hundred forty-three thousand, seven hundred nineteen".