113213122021 has 4 divisors (see below), whose sum is σ = 119872717452. Its totient is φ = 106553526592.

The previous prime is 113213122007. The next prime is 113213122051. The reversal of 113213122021 is 120221312311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120221312311 = 1237 ⋅97187803.

It can be written as a sum of positive squares in 2 ways, for example, as 97484450625 + 15728671396 = 312225^2 + 125414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113213122021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 113213122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113213122051) 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, 3329797690 + ... + 3329797723.

It is an arithmetic number, because the mean of its divisors is an integer number (29968179363).

Almost surely, 2^113213122021 is an apocalyptic number.

It is an amenable number.

113213122021 is a deficient number, since it is larger than the sum of its proper divisors (6659595431).

113213122021 is an equidigital number, since it uses as much as digits as its factorization.

113213122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659595430.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 113213122021 its reverse (120221312311), we get a palindrome (233434434332).

The spelling of 113213122021 in words is "one hundred thirteen billion, two hundred thirteen million, one hundred twenty-two thousand, twenty-one".