113100021 has 6 divisors (see below), whose sum is σ = 163366710. Its totient is φ = 75400008.

The previous prime is 113100007. The next prime is 113100047. The reversal of 113100021 is 120001311.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 45037521 = 8250^2 + 6711^2 .

It is not a de Polignac number, because 113100021 - 2⁷ = 113099893 is a prime.

It is a super-2 number, since 2×113100021² = 25583229500400882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 12566669 = 113100021 / (1 + 1 + 3 + 1 + 0 + 0 + 0 + 2 + 1).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 113099976 and 113100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113100061) 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 in 5 ways as a sum of consecutive naturals, for example, 6283326 + ... + 6283343.

It is an arithmetic number, because the mean of its divisors is an integer number (27227785).

Almost surely, 2^113100021 is an apocalyptic number.

It is an amenable number.

113100021 is a deficient number, since it is larger than the sum of its proper divisors (50266689).

113100021 is a wasteful number, since it uses less digits than its factorization.

113100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12566675 (or 12566672 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 113100021 is about 10634.8493642364. The cubic root of 113100021 is about 483.6014138132.

Adding to 113100021 its reverse (120001311), we get a palindrome (233101332).

The spelling of 113100021 in words is "one hundred thirteen million, one hundred thousand, twenty-one".