21594113 has 2 divisors, whose sum is σ = 21594114. Its totient is φ = 21594112.

The previous prime is 21594107. The next prime is 21594137. The reversal of 21594113 is 31149512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21224449 + 369664 = 4607^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 21594113 - 2⁶ = 21594049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21594613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10797056 + 10797057.

It is an arithmetic number, because the mean of its divisors is an integer number (10797057).

It is a Proth number, since it is equal to 659 ⋅ 2¹⁵ + 1 and 659 < 2¹⁵.

Almost surely, 2^21594113 is an apocalyptic number.

It is an amenable number.

21594113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21594113 is an equidigital number, since it uses as much as digits as its factorization.

21594113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 21594113 is about 4646.9466319294. The cubic root of 21594113 is about 278.4700267609.

The spelling of 21594113 in words is "twenty-one million, five hundred ninety-four thousand, one hundred thirteen".