1231122211 has 16 divisors (see below), whose sum is σ = 1384322688. Its totient is φ = 1085140800.

The previous prime is 1231122197. The next prime is 1231122247. The reversal of 1231122211 is 1122211321.

It is a cyclic number.

It is not a de Polignac number, because 1231122211 - 2⁹ = 1231121699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231122911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65140 + ... + 81886.

It is an arithmetic number, because the mean of its divisors is an integer number (86520168).

Almost surely, 2^1231122211 is an apocalyptic number.

1231122211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231122211 is a deficient number, since it is larger than the sum of its proper divisors (153200477).

1231122211 is a wasteful number, since it uses less digits than its factorization.

1231122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16962.

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

The square root of 1231122211 is about 35087.3511539415. The cubic root of 1231122211 is about 1071.7670197429.

Adding to 1231122211 its reverse (1122211321), we get a palindrome (2353333532).

The spelling of 1231122211 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, two hundred eleven".