21075113 has 2 divisors, whose sum is σ = 21075114. Its totient is φ = 21075112.

The previous prime is 21075091. The next prime is 21075137. The reversal of 21075113 is 31157012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 7333264 = 3707^2 + 2708^2 .

It is a cyclic number.

It is not a de Polignac number, because 21075113 - 2⁶ = 21075049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21075413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10537556 + 10537557.

It is an arithmetic number, because the mean of its divisors is an integer number (10537557).

Almost surely, 2^21075113 is an apocalyptic number.

It is an amenable number.

21075113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21075113 is an equidigital number, since it uses as much as digits as its factorization.

21075113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 21075113 is about 4590.7638797917. The cubic root of 21075113 is about 276.2209644415.

The spelling of 21075113 in words is "twenty-one million, seventy-five thousand, one hundred thirteen".