113420021 has 16 divisors (see below), whose sum is σ = 134447040. Its totient is φ = 94321920.

The previous prime is 113420009. The next prime is 113420023. The reversal of 113420021 is 120024311.

It is not a de Polignac number, because 113420021 - 2¹⁴ = 113403637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113419978 and 113420005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113420023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12650 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (8402940).

Almost surely, 2^113420021 is an apocalyptic number.

113420021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

113420021 is a deficient number, since it is larger than the sum of its proper divisors (21027019).

113420021 is a wasteful number, since it uses less digits than its factorization.

113420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 113420021 is about 10649.8836143875. The cubic root of 113420021 is about 484.0570775411.

Adding to 113420021 its reverse (120024311), we get a palindrome (233444332).

The spelling of 113420021 in words is "one hundred thirteen million, four hundred twenty thousand, twenty-one".