1121312211 has 4 divisors (see below), whose sum is σ = 1495082952. Its totient is φ = 747541472.

The previous prime is 1121312209. The next prime is 1121312219. The reversal of 1121312211 is 1122131211.

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 1121312211 - 2¹ = 1121312209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121312219) 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, 186885366 + ... + 186885371.

It is an arithmetic number, because the mean of its divisors is an integer number (373770738).

Almost surely, 2^1121312211 is an apocalyptic number.

1121312211 is a deficient number, since it is larger than the sum of its proper divisors (373770741).

1121312211 is an equidigital number, since it uses as much as digits as its factorization.

1121312211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373770740.

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

The square root of 1121312211 is about 33486.0002239742. Note that the first 3 decimals coincide. The cubic root of 1121312211 is about 1038.9042363591.

Subtracting from 1121312211 its sum of digits (15), we obtain a square (1121312196 = 33486²).

Adding to 1121312211 its reverse (1122131211), we get a palindrome (2243443422).

The spelling of 1121312211 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, two hundred eleven".