113210021 has 4 divisors (see below), whose sum is σ = 119869452. Its totient is φ = 106550592.

The previous prime is 113210017. The next prime is 113210023. The reversal of 113210021 is 120012311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120012311 = 1153 ⋅104087.

It can be written as a sum of positive squares in 2 ways, for example, as 47761921 + 65448100 = 6911^2 + 8090^2 .

It is a cyclic number.

It is not a de Polignac number, because 113210021 - 2² = 113210017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113209984 and 113210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113210023) 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 3 ways as a sum of consecutive naturals, for example, 3329690 + ... + 3329723.

It is an arithmetic number, because the mean of its divisors is an integer number (29967363).

Almost surely, 2^113210021 is an apocalyptic number.

It is an amenable number.

113210021 is a deficient number, since it is larger than the sum of its proper divisors (6659431).

113210021 is an equidigital number, since it uses as much as digits as its factorization.

113210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659430.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 113210021 is about 10640.0197838162. The cubic root of 113210021 is about 483.7581450509.

Adding to 113210021 its reverse (120012311), we get a palindrome (233222332).

The spelling of 113210021 in words is "one hundred thirteen million, two hundred ten thousand, twenty-one".