21623075519 has 2 divisors, whose sum is σ = 21623075520. Its totient is φ = 21623075518.

The previous prime is 21623075483. The next prime is 21623075569. The reversal of 21623075519 is 91557032612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21623075519 - 2⁸ = 21623075263 is a prime.

It is a super-2 number, since 2×21623075519² (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 (21623075569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811537759 + 10811537760.

It is an arithmetic number, because the mean of its divisors is an integer number (10811537760).

Almost surely, 2^21623075519 is an apocalyptic number.

21623075519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21623075519 is an equidigital number, since it uses as much as digits as its factorization.

21623075519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 21623075519 in words is "twenty-one billion, six hundred twenty-three million, seventy-five thousand, five hundred nineteen".