20121313144423 has 4 divisors (see below), whose sum is σ = 20121432791680. Its totient is φ = 20121193497168.

The previous prime is 20121313144403. The next prime is 20121313144487. The reversal of 20121313144423 is 32444131312102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121313144423 - 2²⁹ = 20120776273511 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 (20121313144403) 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, 59571015 + ... + 59907832.

It is an arithmetic number, because the mean of its divisors is an integer number (5030358197920).

Almost surely, 2^{20121313144423} is an apocalyptic number.

20121313144423 is a deficient number, since it is larger than the sum of its proper divisors (119647257).

20121313144423 is a wasteful number, since it uses less digits than its factorization.

20121313144423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119647256.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 20121313144423 its reverse (32444131312102), we get a palindrome (52565444456525).

The spelling of 20121313144423 in words is "twenty trillion, one hundred twenty-one billion, three hundred thirteen million, one hundred forty-four thousand, four hundred twenty-three".