12021021231 has 16 divisors (see below), whose sum is σ = 16734771456. Its totient is φ = 7661054016.

The previous prime is 12021021203. The next prime is 12021021253. The reversal of 12021021231 is 13212012021.

It is not a de Polignac number, because 12021021231 - 2⁶ = 12021021167 is a prime.

It is a super-2 number, since 2×12021021231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12021021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021021031) 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, 68331 + ... + 169443.

It is an arithmetic number, because the mean of its divisors is an integer number (1045923216).

Almost surely, 2^12021021231 is an apocalyptic number.

12021021231 is a deficient number, since it is larger than the sum of its proper divisors (4713750225).

12021021231 is a wasteful number, since it uses less digits than its factorization.

12021021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102862.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12021021231 its reverse (13212012021), we get a palindrome (25233033252).

The spelling of 12021021231 in words is "twelve billion, twenty-one million, twenty-one thousand, two hundred thirty-one".