12021311231 has 8 divisors (see below), whose sum is σ = 12161305200. Its totient is φ = 11881857600.

The previous prime is 12021311219. The next prime is 12021311243. The reversal of 12021311231 is 13211312021.

It is an interprime number because it is at equal distance from previous prime (12021311219) and next prime (12021311243).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021311231 is a prime.

It is a super-2 number, since 2×12021311231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021311831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90245 + ... + 179406.

It is an arithmetic number, because the mean of its divisors is an integer number (1520163150).

Almost surely, 2^12021311231 is an apocalyptic number.

12021311231 is a deficient number, since it is larger than the sum of its proper divisors (139993969).

12021311231 is a wasteful number, since it uses less digits than its factorization.

12021311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270169.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12021311231 its reverse (13211312021), we get a palindrome (25232623252).

The spelling of 12021311231 in words is "twelve billion, twenty-one million, three hundred eleven thousand, two hundred thirty-one".