1321122211 has 4 divisors (see below), whose sum is σ = 1332813672. Its totient is φ = 1309430752.

The previous prime is 1321122203. The next prime is 1321122217. The reversal of 1321122211 is 1122211231.

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 1321122211 - 2³ = 1321122203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321122217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5845561 + ... + 5845786.

It is an arithmetic number, because the mean of its divisors is an integer number (333203418).

Almost surely, 2^1321122211 is an apocalyptic number.

1321122211 is a deficient number, since it is larger than the sum of its proper divisors (11691461).

1321122211 is a wasteful number, since it uses less digits than its factorization.

1321122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11691460.

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

The square root of 1321122211 is about 36347.2448887120. The cubic root of 1321122211 is about 1097.2720865872.

Adding to 1321122211 its reverse (1122211231), we get a palindrome (2443333442).

The spelling of 1321122211 in words is "one billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred eleven".