20123303021 has 4 divisors (see below), whose sum is σ = 20213542272. Its totient is φ = 20033063772.

The previous prime is 20123302999. The next prime is 20123303041. The reversal of 20123303021 is 12030332102.

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 20123303021 - 2¹⁸ = 20123040877 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 (20123303041) 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, 45119291 + ... + 45119736.

It is an arithmetic number, because the mean of its divisors is an integer number (5053385568).

Almost surely, 2^20123303021 is an apocalyptic number.

It is an amenable number.

20123303021 is a deficient number, since it is larger than the sum of its proper divisors (90239251).

20123303021 is an equidigital number, since it uses as much as digits as its factorization.

20123303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90239250.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20123303021 its reverse (12030332102), we get a palindrome (32153635123).

It can be divided in two parts, 2012 and 3303021, that added together give a palindrome (3305033).

The spelling of 20123303021 in words is "twenty billion, one hundred twenty-three million, three hundred three thousand, twenty-one".