1211112321 has 4 divisors (see below), whose sum is σ = 1614816432. Its totient is φ = 807408212.

The previous prime is 1211112271. The next prime is 1211112323. The reversal of 1211112321 is 1232111121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211112321 - 2²⁷ = 1076894593 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211112321.

It is not an unprimeable number, because it can be changed into a prime (1211112323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201852051 + ... + 201852056.

It is an arithmetic number, because the mean of its divisors is an integer number (403704108).

Almost surely, 2^1211112321 is an apocalyptic number.

It is an amenable number.

1211112321 is a deficient number, since it is larger than the sum of its proper divisors (403704111).

1211112321 is an equidigital number, since it uses as much as digits as its factorization.

1211112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403704110.

The product of its digits is 24, while the sum is 15.

The square root of 1211112321 is about 34801.0390793149. The cubic root of 1211112321 is about 1065.9286634136.

Adding to 1211112321 its reverse (1232111121), we get a palindrome (2443223442).

The spelling of 1211112321 in words is "one billion, two hundred eleven million, one hundred twelve thousand, three hundred twenty-one".