1222121211 has 64 divisors (see below), whose sum is σ = 1891123200. Its totient is φ = 697061376.

The previous prime is 1222121207. The next prime is 1222121233. The reversal of 1222121211 is 1121212221.

1222121211 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1222121211 - 2² = 1222121207 is a prime.

It is a super-2 number, since 2×1222121211² = 2987160508752213042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1222121291) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3190726 + ... + 3191108.

It is an arithmetic number, because the mean of its divisors is an integer number (29548800).

Almost surely, 2^1222121211 is an apocalyptic number.

1222121211 is a deficient number, since it is larger than the sum of its proper divisors (669001989).

1222121211 is a wasteful number, since it uses less digits than its factorization.

1222121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548.

The product of its digits is 32, while the sum is 15.

The square root of 1222121211 is about 34958.8502528330. The cubic root of 1222121211 is about 1069.1486549178.

Adding to 1222121211 its reverse (1121212221), we get a palindrome (2343333432).

The spelling of 1222121211 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".