113564021 has 2 divisors, whose sum is σ = 113564022. Its totient is φ = 113564020.

The previous prime is 113563993. The next prime is 113564027. The reversal of 113564021 is 120465311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112063396 + 1500625 = 10586^2 + 1225^2 .

It is an emirp because it is prime and its reverse (120465311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113564021 - 2²² = 109369717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113564027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56782010 + 56782011.

It is an arithmetic number, because the mean of its divisors is an integer number (56782011).

Almost surely, 2^113564021 is an apocalyptic number.

It is an amenable number.

113564021 is a deficient number, since it is larger than the sum of its proper divisors (1).

113564021 is an equidigital number, since it uses as much as digits as its factorization.

113564021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 113564021 is about 10656.6421071555. The cubic root of 113564021 is about 484.2618466231.

It can be divided in two parts, 1135 and 64021, that added together give a palindrome (65156).

The spelling of 113564021 in words is "one hundred thirteen million, five hundred sixty-four thousand, twenty-one".