123100215 has 32 divisors (see below), whose sum is σ = 232865280. Its totient is φ = 54332544.

The previous prime is 123100171. The next prime is 123100223. The reversal of 123100215 is 512001321.

It is not a de Polignac number, because 123100215 - 2⁸ = 123099959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 123100194 and 123100203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17169 + ... + 23258.

It is an arithmetic number, because the mean of its divisors is an integer number (7277040).

Almost surely, 2^123100215 is an apocalyptic number.

123100215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123100215 is a deficient number, since it is larger than the sum of its proper divisors (109765065).

123100215 is a wasteful number, since it uses less digits than its factorization.

123100215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40471.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 123100215 is about 11095.0536276306. The cubic root of 123100215 is about 497.4540112199.

Adding to 123100215 its reverse (512001321), we get a palindrome (635101536).

The spelling of 123100215 in words is "one hundred twenty-three million, one hundred thousand, two hundred fifteen".