121242231 has 16 divisors (see below), whose sum is σ = 195947520. Its totient is φ = 73479960.

The previous prime is 121242221. The next prime is 121242293. The reversal of 121242231 is 132242121.

It is a happy number.

121242231 is a `hidden beast` number, since 1 + 212 + 422 + 31 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-121242231 is a prime.

It is a super-2 number, since 2×121242231² = 29399357155714722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203815 + ... + 204408.

It is an arithmetic number, because the mean of its divisors is an integer number (12246720).

Almost surely, 2^121242231 is an apocalyptic number.

121242231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121242231 is a deficient number, since it is larger than the sum of its proper divisors (74705289).

121242231 is a wasteful number, since it uses less digits than its factorization.

121242231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408243 (or 408237 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 121242231 is about 11011.0049950039. The cubic root of 121242231 is about 494.9385782374.

Adding to 121242231 its reverse (132242121), we get a palindrome (253484352).

The spelling of 121242231 in words is "one hundred twenty-one million, two hundred forty-two thousand, two hundred thirty-one".