123212213211 has 4 divisors (see below), whose sum is σ = 164282950952. Its totient is φ = 82141475472.

The previous prime is 123212213191. The next prime is 123212213221. The reversal of 123212213211 is 112312212321.

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

It is not a de Polignac number, because 123212213211 - 2⁶ = 123212213147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123212213221) 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, 20535368866 + ... + 20535368871.

It is an arithmetic number, because the mean of its divisors is an integer number (41070737738).

Almost surely, 2^123212213211 is an apocalyptic number.

123212213211 is a deficient number, since it is larger than the sum of its proper divisors (41070737741).

123212213211 is an equidigital number, since it uses as much as digits as its factorization.

123212213211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41070737740.

The product of its digits is 288, while the sum is 21.

Adding to 123212213211 its reverse (112312212321), we get a palindrome (235524425532).

The spelling of 123212213211 in words is "one hundred twenty-three billion, two hundred twelve million, two hundred thirteen thousand, two hundred eleven".