1122121211 has 4 divisors (see below), whose sum is σ = 1133231424. Its totient is φ = 1111011000.

The previous prime is 1122121201. The next prime is 1122121213. The reversal of 1122121211 is 1121212211.

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 1122121211 - 2²² = 1117926907 is a prime.

It is a super-2 number, since 2×1122121211² = 2518312024352213042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1122121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5554955 + ... + 5555156.

It is an arithmetic number, because the mean of its divisors is an integer number (283307856).

Almost surely, 2^1122121211 is an apocalyptic number.

1122121211 is a deficient number, since it is larger than the sum of its proper divisors (11110213).

1122121211 is a wasteful number, since it uses less digits than its factorization.

1122121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110212.

The product of its digits is 16, while the sum is 14.

The square root of 1122121211 is about 33498.0777209678. The cubic root of 1122121211 is about 1039.1540245010.

Adding to 1122121211 its reverse (1121212211), we get a palindrome (2243333422).

The spelling of 1122121211 in words is "one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".