12312020021 has 16 divisors (see below), whose sum is σ = 14408279424. Its totient is φ = 10300457664.

The previous prime is 12312020009. The next prime is 12312020027. The reversal of 12312020021 is 12002021321.

It is a happy number.

It is not a de Polignac number, because 12312020021 - 2⁶ = 12312019957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12312019978 and 12312020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312020027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435695 + ... + 463091.

It is an arithmetic number, because the mean of its divisors is an integer number (900517464).

Almost surely, 2^12312020021 is an apocalyptic number.

It is an amenable number.

12312020021 is a deficient number, since it is larger than the sum of its proper divisors (2096259403).

12312020021 is a wasteful number, since it uses less digits than its factorization.

12312020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28940.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12312020021 its reverse (12002021321), we get a palindrome (24314041342).

The spelling of 12312020021 in words is "twelve billion, three hundred twelve million, twenty thousand, twenty-one".