113605021 has 2 divisors, whose sum is σ = 113605022. Its totient is φ = 113605020.

The previous prime is 113605007. The next prime is 113605039. The reversal of 113605021 is 120506311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107868996 + 5736025 = 10386^2 + 2395^2 .

It is an emirp because it is prime and its reverse (120506311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113605021 - 2⁷ = 113604893 is a prime.

It is a super-2 number, since 2×113605021² = 25812201592820882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 113605021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113605061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56802510 + 56802511.

It is an arithmetic number, because the mean of its divisors is an integer number (56802511).

Almost surely, 2^113605021 is an apocalyptic number.

It is an amenable number.

113605021 is a deficient number, since it is larger than the sum of its proper divisors (1).

113605021 is an equidigital number, since it uses as much as digits as its factorization.

113605021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 113605021 is about 10658.5656164420. The cubic root of 113605021 is about 484.3201172697.

Adding to 113605021 its product of nonzero digits (180), we get a triangular number (113605201 = T₁₅₀₇₃).

The spelling of 113605021 in words is "one hundred thirteen million, six hundred five thousand, twenty-one".