12030023021 has 4 divisors (see below), whose sum is σ = 12737671452. Its totient is φ = 11322374592.

The previous prime is 12030023003. The next prime is 12030023069. The reversal of 12030023021 is 12032003021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12032003021 = 211 ⋅57023711.

It can be written as a sum of positive squares in 2 ways, for example, as 11212692100 + 817330921 = 105890^2 + 28589^2 .

It is a cyclic number.

It is not a de Polignac number, because 12030023021 - 2²⁶ = 11962914157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12030022987 and 12030023005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12030023081) 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, 353824190 + ... + 353824223.

It is an arithmetic number, because the mean of its divisors is an integer number (3184417863).

Almost surely, 2^12030023021 is an apocalyptic number.

It is an amenable number.

12030023021 is a deficient number, since it is larger than the sum of its proper divisors (707648431).

12030023021 is an equidigital number, since it uses as much as digits as its factorization.

12030023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707648430.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 12030023021 its reverse (12032003021), we get a palindrome (24062026042).

The spelling of 12030023021 in words is "twelve billion, thirty million, twenty-three thousand, twenty-one".