212445123 has 16 divisors (see below), whose sum is σ = 315588096. Its totient is φ = 126014240.

The previous prime is 212445119. The next prime is 212445161. The reversal of 212445123 is 321544212.

212445123 = 3097² + 3098² + ... + 3118².

It is not a de Polignac number, because 212445123 - 2² = 212445119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212445093 and 212445102.

It is not an unprimeable number, because it can be changed into a prime (212445113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66936 + ... + 70037.

It is an arithmetic number, because the mean of its divisors is an integer number (19724256).

Almost surely, 2^212445123 is an apocalyptic number.

212445123 is a deficient number, since it is larger than the sum of its proper divisors (103142973).

212445123 is a wasteful number, since it uses less digits than its factorization.

212445123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137034.

The product of its digits is 1920, while the sum is 24.

The square root of 212445123 is about 14575.4973500049. The cubic root of 212445123 is about 596.6902230885.

Adding to 212445123 its reverse (321544212), we get a palindrome (533989335).

The spelling of 212445123 in words is "two hundred twelve million, four hundred forty-five thousand, one hundred twenty-three".