1222221311 has 4 divisors (see below), whose sum is σ = 1275361392. Its totient is φ = 1169081232.

The previous prime is 1222221263. The next prime is 1222221317. The reversal of 1222221311 is 1131222221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222221311 - 2¹⁴ = 1222204927 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 1222221311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221317) 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, 26570006 + ... + 26570051.

It is an arithmetic number, because the mean of its divisors is an integer number (318840348).

Almost surely, 2^1222221311 is an apocalyptic number.

1222221311 is a deficient number, since it is larger than the sum of its proper divisors (53140081).

1222221311 is an equidigital number, since it uses as much as digits as its factorization.

1222221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53140080.

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

The square root of 1222221311 is about 34960.2819067581. The cubic root of 1222221311 is about 1069.1778442916.

Adding to 1222221311 its reverse (1131222221), we get a palindrome (2353443532).

It can be divided in two parts, 12222 and 21311, that added together give a palindrome (33533).

The spelling of 1222221311 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, three hundred eleven".