20123023120021 has 4 divisors (see below), whose sum is σ = 20365469181792. Its totient is φ = 19880577058252.

The previous prime is 20123023120009. The next prime is 20123023120027. The reversal of 20123023120021 is 12002132032102.

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 20123023120021 - 2²¹ = 20123021022869 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 (20123023120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121223030761 + ... + 121223030926.

It is an arithmetic number, because the mean of its divisors is an integer number (5091367295448).

Almost surely, 2^{20123023120021} is an apocalyptic number.

It is an amenable number.

20123023120021 is a deficient number, since it is larger than the sum of its proper divisors (242446061771).

20123023120021 is an equidigital number, since it uses as much as digits as its factorization.

20123023120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242446061770.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20123023120021 its reverse (12002132032102), we get a palindrome (32125155152123).

The spelling of 20123023120021 in words is "twenty trillion, one hundred twenty-three billion, twenty-three million, one hundred twenty thousand, twenty-one".