123221331 has 20 divisors (see below), whose sum is σ = 185980872. Its totient is φ = 81295488.

The previous prime is 123221297. The next prime is 123221341. The reversal of 123221331 is 133122321.

123221331 is a `hidden beast` number, since 12 + 322 + 1 + 331 = 666.

It is not a de Polignac number, because 123221331 - 2⁹ = 123220819 is a prime.

It is a super-2 number, since 2×123221331² = 30366992826823122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123221341) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16 + ... + 15698.

Almost surely, 2^123221331 is an apocalyptic number.

123221331 is a deficient number, since it is larger than the sum of its proper divisors (62759541).

123221331 is an equidigital number, since it uses as much as digits as its factorization.

123221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15792 (or 15783 counting only the distinct ones).

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

The square root of 123221331 is about 11100.5103936711. The cubic root of 123221331 is about 497.6171029776.

Adding to 123221331 its reverse (133122321), we get a palindrome (256343652).

The spelling of 123221331 in words is "one hundred twenty-three million, two hundred twenty-one thousand, three hundred thirty-one".