123112210 has 32 divisors (see below), whose sum is σ = 251213760. Its totient is φ = 43063488.

The previous prime is 123112201. The next prime is 123112211. The reversal of 123112210 is 12211321.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (123112211) 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 15 ways as a sum of consecutive naturals, for example, 22452 + ... + 27391.

It is an arithmetic number, because the mean of its divisors is an integer number (7850430).

Almost surely, 2^123112210 is an apocalyptic number.

123112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123112210 is an abundant number, since it is smaller than the sum of its proper divisors (128101550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123112210 is a wasteful number, since it uses less digits than its factorization.

123112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49882.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 123112210 is about 11095.5941706607. The cubic root of 123112210 is about 497.4701681564.

Adding to 123112210 its reverse (12211321), we get a palindrome (135323531).

The spelling of 123112210 in words is "one hundred twenty-three million, one hundred twelve thousand, two hundred ten".