20123111122013 has 4 divisors (see below), whose sum is σ = 20126184767040. Its totient is φ = 20120037476988.

The previous prime is 20123111121943. The next prime is 20123111122039. The reversal of 20123111122013 is 31022111132102.

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 20123111122013 - 2³⁴ = 20105931252829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123111172013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536812693 + ... + 1536825786.

It is an arithmetic number, because the mean of its divisors is an integer number (5031546191760).

Almost surely, 2^{20123111122013} is an apocalyptic number.

It is an amenable number.

20123111122013 is a deficient number, since it is larger than the sum of its proper divisors (3073645027).

20123111122013 is an equidigital number, since it uses as much as digits as its factorization.

20123111122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3073645026.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20123111122013 its reverse (31022111132102), we get a palindrome (51145222254115).

The spelling of 20123111122013 in words is "twenty trillion, one hundred twenty-three billion, one hundred eleven million, one hundred twenty-two thousand, thirteen".