1211112123 has 32 divisors (see below), whose sum is σ = 1857085440. Its totient is φ = 696366720.

The previous prime is 1211112103. The next prime is 1211112139. The reversal of 1211112123 is 3212111121.

It is not a de Polignac number, because 1211112123 - 2⁶ = 1211112059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211112103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17790 + ... + 52332.

It is an arithmetic number, because the mean of its divisors is an integer number (58033920).

Almost surely, 2^1211112123 is an apocalyptic number.

1211112123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211112123 is a deficient number, since it is larger than the sum of its proper divisors (645973317).

1211112123 is a wasteful number, since it uses less digits than its factorization.

1211112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34619.

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

The square root of 1211112123 is about 34801.0362345721. The cubic root of 1211112123 is about 1065.9286053254.

Adding to 1211112123 its reverse (3212111121), we get a palindrome (4423223244).

The spelling of 1211112123 in words is "one billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-three".