20113013121 has 4 divisors (see below), whose sum is σ = 26817350832. Its totient is φ = 13408675412.

The previous prime is 20113013111. The next prime is 20113013149. The reversal of 20113013121 is 12131031102.

It is a happy number.

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 20113013121 - 2⁶ = 20113013057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20113013121.

It is not an unprimeable number, because it can be changed into a prime (20113013111) 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, 3352168851 + ... + 3352168856.

It is an arithmetic number, because the mean of its divisors is an integer number (6704337708).

Almost surely, 2^20113013121 is an apocalyptic number.

It is an amenable number.

20113013121 is a deficient number, since it is larger than the sum of its proper divisors (6704337711).

20113013121 is an equidigital number, since it uses as much as digits as its factorization.

20113013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704337710.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20113013121 its reverse (12131031102), we get a palindrome (32244044223).

The spelling of 20113013121 in words is "twenty billion, one hundred thirteen million, thirteen thousand, one hundred twenty-one".