123212133221 has 32 divisors (see below), whose sum is σ = 135604022400. Its totient is φ = 111667691520.

The previous prime is 123212133217. The next prime is 123212133227. The reversal of 123212133221 is 122331212321.

It is a cyclic number.

It is not a de Polignac number, because 123212133221 - 2² = 123212133217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212133227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3407525 + ... + 3443493.

It is an arithmetic number, because the mean of its divisors is an integer number (4237625700).

Almost surely, 2^123212133221 is an apocalyptic number.

It is an amenable number.

123212133221 is a deficient number, since it is larger than the sum of its proper divisors (12391889179).

123212133221 is a wasteful number, since it uses less digits than its factorization.

123212133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36149.

The product of its digits is 864, while the sum is 23.

Adding to 123212133221 its reverse (122331212321), we get a palindrome (245543345542).

The spelling of 123212133221 in words is "one hundred twenty-three billion, two hundred twelve million, one hundred thirty-three thousand, two hundred twenty-one".