21594101 has 2 divisors, whose sum is σ = 21594102. Its totient is φ = 21594100.

The previous prime is 21594091. The next prime is 21594107. The reversal of 21594101 is 10149512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 3147076 = 4295^2 + 1774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21594101 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21594107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10797050 + 10797051.

It is an arithmetic number, because the mean of its divisors is an integer number (10797051).

Almost surely, 2^21594101 is an apocalyptic number.

It is an amenable number.

21594101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21594101 is an equidigital number, since it uses as much as digits as its factorization.

21594101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21594101 is about 4646.9453407588. The cubic root of 21594101 is about 278.4699751784.

The spelling of 21594101 in words is "twenty-one million, five hundred ninety-four thousand, one hundred one".