113613500021 has 4 divisors (see below), whose sum is σ = 129844000032. Its totient is φ = 97383000012.

The previous prime is 113613499981. The next prime is 113613500029. The reversal of 113613500021 is 120005316311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 113613500021 - 2⁶ = 113613499957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 113613500021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113613500029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8115249995 + ... + 8115250008.

It is an arithmetic number, because the mean of its divisors is an integer number (32461000008).

Almost surely, 2^113613500021 is an apocalyptic number.

It is an amenable number.

113613500021 is a deficient number, since it is larger than the sum of its proper divisors (16230500011).

113613500021 is an equidigital number, since it uses as much as digits as its factorization.

113613500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16230500010.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 113613500021 its reverse (120005316311), we get a palindrome (233618816332).

The spelling of 113613500021 in words is "one hundred thirteen billion, six hundred thirteen million, five hundred thousand, twenty-one".