12023100021 has 4 divisors (see below), whose sum is σ = 16030800032. Its totient is φ = 8015400012.

The previous prime is 12023100007. The next prime is 12023100031. The reversal of 12023100021 is 12000132021.

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 not a de Polignac number, because 12023100021 - 2⁵ = 12023099989 is a prime.

It is a super-2 number, since 2×12023100021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12023100031) 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, 2003850001 + ... + 2003850006.

It is an arithmetic number, because the mean of its divisors is an integer number (4007700008).

Almost surely, 2^12023100021 is an apocalyptic number.

It is an amenable number.

12023100021 is a deficient number, since it is larger than the sum of its proper divisors (4007700011).

12023100021 is an equidigital number, since it uses as much as digits as its factorization.

12023100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007700010.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 12023100021 its reverse (12000132021), we get a palindrome (24023232042).

The spelling of 12023100021 in words is "twelve billion, twenty-three million, one hundred thousand, twenty-one".