212315123 has 6 divisors (see below), whose sum is σ = 217369404. Its totient is φ = 207375756.

The previous prime is 212315111. The next prime is 212315137. The reversal of 212315123 is 321513212.

It is not a de Polignac number, because 212315123 - 2⁸ = 212314867 is a prime.

It is a super-2 number, since 2×212315123² = 90155422909010258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212315095 and 212315104.

It is not an unprimeable number, because it can be changed into a prime (212315723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55565 + ... + 59262.

It is an arithmetic number, because the mean of its divisors is an integer number (36228234).

Almost surely, 2^212315123 is an apocalyptic number.

212315123 is a deficient number, since it is larger than the sum of its proper divisors (5054281).

212315123 is an equidigital number, since it uses as much as digits as its factorization.

212315123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114913 (or 114870 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 212315123 is about 14571.0371284957. The cubic root of 212315123 is about 596.5684888174.

Adding to 212315123 its reverse (321513212), we get a palindrome (533828335).

The spelling of 212315123 in words is "two hundred twelve million, three hundred fifteen thousand, one hundred twenty-three".