12122312021 has 4 divisors (see below), whose sum is σ = 12122888352. Its totient is φ = 12121735692.

The previous prime is 12122311997. The next prime is 12122312039. The reversal of 12122312021 is 12021322121.

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 12122312021 - 2¹⁴ = 12122295637 is a prime.

It is a super-2 number, since 2×12122312021² (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 (12122312071) 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, 255371 + ... + 299096.

It is an arithmetic number, because the mean of its divisors is an integer number (3030722088).

Almost surely, 2^12122312021 is an apocalyptic number.

It is an amenable number.

12122312021 is a deficient number, since it is larger than the sum of its proper divisors (576331).

12122312021 is an equidigital number, since it uses as much as digits as its factorization.

12122312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576330.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12122312021 its reverse (12021322121), we get a palindrome (24143634142).

The spelling of 12122312021 in words is "twelve billion, one hundred twenty-two million, three hundred twelve thousand, twenty-one".