21644094083 has 2 divisors, whose sum is σ = 21644094084. Its totient is φ = 21644094082.

The previous prime is 21644094067. The next prime is 21644094103. The reversal of 21644094083 is 38049044612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21644094083 - 2⁴ = 21644094067 is a prime.

It is a super-2 number, since 2×21644094083² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21644094083.

It is not a weakly prime, because it can be changed into another prime (21644094013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10822047041 + 10822047042.

It is an arithmetic number, because the mean of its divisors is an integer number (10822047042).

Almost surely, 2^21644094083 is an apocalyptic number.

21644094083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21644094083 is an equidigital number, since it uses as much as digits as its factorization.

21644094083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 21644094083 in words is "twenty-one billion, six hundred forty-four million, ninety-four thousand, eighty-three".