1221112231 has 8 divisors (see below), whose sum is σ = 1226156400. Its totient is φ = 1216079040.

The previous prime is 1221112201. The next prime is 1221112241. The reversal of 1221112231 is 1322111221.

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 1221112231 - 2⁹ = 1221111719 is a prime.

It is a super-2 number, since 2×1221112231² = 2982230161395594722, which 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 (1221112201) 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, 274755 + ... + 279163.

It is an arithmetic number, because the mean of its divisors is an integer number (153269550).

Almost surely, 2^1221112231 is an apocalyptic number.

1221112231 is a deficient number, since it is larger than the sum of its proper divisors (5044169).

1221112231 is an equidigital number, since it uses as much as digits as its factorization.

1221112231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489.

The product of its digits is 48, while the sum is 16.

The square root of 1221112231 is about 34944.4163064716. The cubic root of 1221112231 is about 1068.8543451534.

Adding to 1221112231 its reverse (1322111221), we get a palindrome (2543223452).

It can be divided in two parts, 12211 and 12231, that added together give a palindrome (24442).

The spelling of 1221112231 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred thirty-one".