123212 has 6 divisors (see below), whose sum is σ = 215628. Its totient is φ = 61604.

The previous prime is 123209. The next prime is 123217. The reversal of 123212 is 212321.

It is a happy number.

123212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 123193 and 123202.

It is not an unprimeable number, because it can be changed into a prime (123217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15398 + ... + 15405.

It is an arithmetic number, because the mean of its divisors is an integer number (35938).

2¹²³²¹² is an apocalyptic number.

It is an amenable number.

123212 is a deficient number, since it is larger than the sum of its proper divisors (92416).

123212 is a wasteful number, since it uses less digits than its factorization.

123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30807 (or 30805 counting only the distinct ones).

The product of its digits is 24, while the sum is 11.

The square root of 123212 is about 351.0156691659. The cubic root of 123212 is about 49.7604541888.

Subtracting from 123212 its sum of digits (11), we obtain a square (123201 = 351²).

Adding to 123212 its reverse (212321), we get a palindrome (335533).

It can be divided in two parts, 12321 and 2, that multiplied together give a palindrome (24642).

The spelling of 123212 in words is "one hundred twenty-three thousand, two hundred twelve", and thus it is an iban number.