21440355319 has 2 divisors, whose sum is σ = 21440355320. Its totient is φ = 21440355318.

The previous prime is 21440355289. The next prime is 21440355323. The reversal of 21440355319 is 91355304412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21440355319 - 2²³ = 21431966711 is a prime.

It is a super-2 number, since 2×21440355319² (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 (21440355329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720177659 + 10720177660.

It is an arithmetic number, because the mean of its divisors is an integer number (10720177660).

Almost surely, 2^21440355319 is an apocalyptic number.

21440355319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440355319 is an equidigital number, since it uses as much as digits as its factorization.

21440355319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21440355319 in words is "twenty-one billion, four hundred forty million, three hundred fifty-five thousand, three hundred nineteen".