12021212231 has 16 divisors (see below), whose sum is σ = 14175522816. Its totient is φ = 9980672256.

The previous prime is 12021212221. The next prime is 12021212237. The reversal of 12021212231 is 13221212021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021212231 is a prime.

It is a super-2 number, since 2×12021212231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021212237) 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, 156431 + ... + 220256.

It is an arithmetic number, because the mean of its divisors is an integer number (885970176).

Almost surely, 2^12021212231 is an apocalyptic number.

12021212231 is a deficient number, since it is larger than the sum of its proper divisors (2154310585).

12021212231 is an equidigital number, since it uses as much as digits as its factorization.

12021212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376838.

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

Adding to 12021212231 its reverse (13221212021), we get a palindrome (25242424252).

The spelling of 12021212231 in words is "twelve billion, twenty-one million, two hundred twelve thousand, two hundred thirty-one".