113240021 has 2 divisors, whose sum is σ = 113240022. Its totient is φ = 113240020.

The previous prime is 113240011. The next prime is 113240047. The reversal of 113240021 is 120042311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62188996 + 51051025 = 7886^2 + 7145^2 .

It is an emirp because it is prime and its reverse (120042311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113240021 - 2¹⁸ = 112977877 is a prime.

It is a super-3 number, since 3×113240021³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 113239978 and 113240005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113240011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56620010 + 56620011.

It is an arithmetic number, because the mean of its divisors is an integer number (56620011).

Almost surely, 2^113240021 is an apocalyptic number.

It is an amenable number.

113240021 is a deficient number, since it is larger than the sum of its proper divisors (1).

113240021 is an equidigital number, since it uses as much as digits as its factorization.

113240021 is an evil number, because the sum of its binary digits is even.

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

The square root of 113240021 is about 10641.4294622480. The cubic root of 113240021 is about 483.8008723127.

Adding to 113240021 its reverse (120042311), we get a palindrome (233282332).

The spelling of 113240021 in words is "one hundred thirteen million, two hundred forty thousand, twenty-one".