21644094093 has 16 divisors (see below), whose sum is σ = 30404114880. Its totient is φ = 13658056704.

The previous prime is 21644094083. The next prime is 21644094103. The reversal of 21644094093 is 39049044612.

It is an interprime number because it is at equal distance from previous prime (21644094083) and next prime (21644094103).

It is not a de Polignac number, because 21644094093 - 2⁶ = 21644094029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21644094013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98946 + ... + 230387.

It is an arithmetic number, because the mean of its divisors is an integer number (1900257180).

Almost surely, 2^21644094093 is an apocalyptic number.

It is an amenable number.

21644094093 is a deficient number, since it is larger than the sum of its proper divisors (8760020787).

21644094093 is a wasteful number, since it uses less digits than its factorization.

21644094093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330508.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 21644094093 in words is "twenty-one billion, six hundred forty-four million, ninety-four thousand, ninety-three".