12021000023 has 4 divisors (see below), whose sum is σ = 12021274968. Its totient is φ = 12020725080.

The previous prime is 12021000007. The next prime is 12021000031. The reversal of 12021000023 is 32000012021.

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 12021000023 - 2⁴ = 12021000007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020999968 and 12021000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000083) 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, 55661 + ... + 164742.

It is an arithmetic number, because the mean of its divisors is an integer number (3005318742).

Almost surely, 2^12021000023 is an apocalyptic number.

12021000023 is a deficient number, since it is larger than the sum of its proper divisors (274945).

12021000023 is an equidigital number, since it uses as much as digits as its factorization.

12021000023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274944.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 12021000023 its reverse (32000012021), we get a palindrome (44021012044).

The spelling of 12021000023 in words is "twelve billion, twenty-one million, twenty-three", and thus it is an aban number and an uban number.