212123103 has 4 divisors (see below), whose sum is σ = 282830808. Its totient is φ = 141415400.

The previous prime is 212123083. The next prime is 212123117. The reversal of 212123103 is 301321212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212123103 - 2⁵ = 212123071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212123143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35353848 + ... + 35353853.

It is an arithmetic number, because the mean of its divisors is an integer number (70707702).

Almost surely, 2^212123103 is an apocalyptic number.

212123103 is a deficient number, since it is larger than the sum of its proper divisors (70707705).

212123103 is an equidigital number, since it uses as much as digits as its factorization.

212123103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70707704.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 212123103 is about 14564.4465394329. The cubic root of 212123103 is about 596.3885869946.

Adding to 212123103 its reverse (301321212), we get a palindrome (513444315).

It can be divided in two parts, 212123 and 103, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 212123103 in words is "two hundred twelve million, one hundred twenty-three thousand, one hundred three".