21696995459 has 2 divisors, whose sum is σ = 21696995460. Its totient is φ = 21696995458.

The previous prime is 21696995393. The next prime is 21696995461. The reversal of 21696995459 is 95459969612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21696995459 - 2²⁸ = 21428560003 is a prime.

It is a super-2 number, since 2×21696995459² (a number of 21 digits) contains 22 as substring.

Together with 21696995461, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21696995395 and 21696995404.

It is not a weakly prime, because it can be changed into another prime (21696992459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848497729 + 10848497730.

It is an arithmetic number, because the mean of its divisors is an integer number (10848497730).

Almost surely, 2^21696995459 is an apocalyptic number.

21696995459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21696995459 is an equidigital number, since it uses as much as digits as its factorization.

21696995459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47239200, while the sum is 65.

The spelling of 21696995459 in words is "twenty-one billion, six hundred ninety-six million, nine hundred ninety-five thousand, four hundred fifty-nine".