20213121044113 has 4 divisors (see below), whose sum is σ = 20236012461808. Its totient is φ = 20190229626420.

The previous prime is 20213121044099. The next prime is 20213121044117. The reversal of 20213121044113 is 31144012131202.

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 20213121044113 - 2²⁵ = 20213087489681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213121044117) 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, 11445707523 + ... + 11445709288.

It is an arithmetic number, because the mean of its divisors is an integer number (5059003115452).

Almost surely, 2^{20213121044113} is an apocalyptic number.

It is an amenable number.

20213121044113 is a deficient number, since it is larger than the sum of its proper divisors (22891417695).

20213121044113 is an equidigital number, since it uses as much as digits as its factorization.

20213121044113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22891417694.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 20213121044113 its reverse (31144012131202), we get a palindrome (51357133175315).

The spelling of 20213121044113 in words is "twenty trillion, two hundred thirteen billion, one hundred twenty-one million, forty-four thousand, one hundred thirteen".