123212013 has 4 divisors (see below), whose sum is σ = 164282688. Its totient is φ = 82141340.

The previous prime is 123211997. The next prime is 123212027. The reversal of 123212013 is 310212321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310212321 = 3 ⋅103404107.

It is a cyclic number.

It is not a de Polignac number, because 123212013 - 2⁴ = 123211997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123211983 and 123212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20535333 + ... + 20535338.

It is an arithmetic number, because the mean of its divisors is an integer number (41070672).

Almost surely, 2^123212013 is an apocalyptic number.

It is an amenable number.

123212013 is a deficient number, since it is larger than the sum of its proper divisors (41070675).

123212013 is an equidigital number, since it uses as much as digits as its factorization.

123212013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41070674.

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

The square root of 123212013 is about 11100.0906753053. The cubic root of 123212013 is about 497.6045593890.

Adding to 123212013 its reverse (310212321), we get a palindrome (433424334).

The spelling of 123212013 in words is "one hundred twenty-three million, two hundred twelve thousand, thirteen".