123133221 has 6 divisors (see below), whose sum is σ = 177859110. Its totient is φ = 82088808.

The previous prime is 123133211. The next prime is 123133249. The reversal of 123133221 is 122331321.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 38750625 = 9186^2 + 6225^2 .

It is not a de Polignac number, because 123133221 - 2⁷ = 123133093 is a prime.

It is a super-2 number, since 2×123133221² = 30323580227669682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123133194 and 123133203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123133201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6840726 + ... + 6840743.

It is an arithmetic number, because the mean of its divisors is an integer number (29643185).

Almost surely, 2^123133221 is an apocalyptic number.

It is an amenable number.

123133221 is a deficient number, since it is larger than the sum of its proper divisors (54725889).

123133221 is a wasteful number, since it uses less digits than its factorization.

123133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13681475 (or 13681472 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 123133221 is about 11096.5409475205. The cubic root of 123133221 is about 497.4984668690.

Adding to 123133221 its reverse (122331321), we get a palindrome (245464542).

The spelling of 123133221 in words is "one hundred twenty-three million, one hundred thirty-three thousand, two hundred twenty-one".