123112220 has 48 divisors (see below), whose sum is σ = 322334208. Its totient is φ = 38372160.

The previous prime is 123112211. The next prime is 123112247. The reversal of 123112220 is 22211321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 123112195 and 123112204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38432 + ... + 41511.

It is an arithmetic number, because the mean of its divisors is an integer number (6715296).

Almost surely, 2^123112220 is an apocalyptic number.

123112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123112220 is an abundant number, since it is smaller than the sum of its proper divisors (199221988).

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

123112220 is a wasteful number, since it uses less digits than its factorization.

123112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79970 (or 79968 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 123112220 is about 11095.5946212900. The cubic root of 123112220 is about 497.4701816257.

Adding to 123112220 its reverse (22211321), we get a palindrome (145323541).

The spelling of 123112220 in words is "one hundred twenty-three million, one hundred twelve thousand, two hundred twenty".