1232112221 has 8 divisors (see below), whose sum is σ = 1256784888. Its totient is φ = 1207584000.

The previous prime is 1232112187. The next prime is 1232112251. The reversal of 1232112221 is 1222112321.

It can be written as a sum of positive squares in 4 ways, for example, as 40896025 + 1191216196 = 6395^2 + 34514^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1232112221 - 2⁶ = 1232112157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1232112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232112251) 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, 18800 + ... + 53081.

It is an arithmetic number, because the mean of its divisors is an integer number (157098111).

Almost surely, 2^1232112221 is an apocalyptic number.

It is an amenable number.

1232112221 is a deficient number, since it is larger than the sum of its proper divisors (24672667).

1232112221 is an equidigital number, since it uses as much as digits as its factorization.

1232112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72223.

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

The square root of 1232112221 is about 35101.4561093981. The cubic root of 1232112221 is about 1072.0542308112.

Adding to 1232112221 its reverse (1222112321), we get a palindrome (2454224542).

It can be divided in two parts, 12321 and 12221, that added together give a palindrome (24542).

The spelling of 1232112221 in words is "one billion, two hundred thirty-two million, one hundred twelve thousand, two hundred twenty-one".