121231231 has 6 divisors (see below), whose sum is σ = 133254296. Its totient is φ = 110210100.

The previous prime is 121231181. The next prime is 121231237. The reversal of 121231231 is 132132121.

It is not a de Polignac number, because 121231231 - 2¹¹ = 121229183 is a prime.

It is a super-2 number, since 2×121231231² = 29394022739550722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231237) 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, 500835 + ... + 501076.

Almost surely, 2^121231231 is an apocalyptic number.

121231231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121231231 is a deficient number, since it is larger than the sum of its proper divisors (12023065).

121231231 is a wasteful number, since it uses less digits than its factorization.

121231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001933 (or 1001922 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 121231231 is about 11010.5054834008. The cubic root of 121231231 is about 494.9236096109.

Adding to 121231231 its reverse (132132121), we get a palindrome (253363352).

The spelling of 121231231 in words is "one hundred twenty-one million, two hundred thirty-one thousand, two hundred thirty-one".