121231212 has 24 divisors (see below), whose sum is σ = 283184496. Its totient is φ = 40365888.

The previous prime is 121231181. The next prime is 121231237. The reversal of 121231212 is 212132121.

121231212 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

121231212 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 121231191 and 121231200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6898 + ... + 17030.

It is an arithmetic number, because the mean of its divisors is an integer number (11799354).

Almost surely, 2^121231212 is an apocalyptic number.

121231212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121231212 is an abundant number, since it is smaller than the sum of its proper divisors (161953284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121231212 is a wasteful number, since it uses less digits than its factorization.

121231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137 (or 11135 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 121231212 is about 11010.5046205885. The cubic root of 121231212 is about 494.9235837552.

Adding to 121231212 its reverse (212132121), we get a palindrome (333363333).

Subtracting 121231212 from its reverse (212132121), we obtain a palindrome (90900909).

The spelling of 121231212 in words is "one hundred twenty-one million, two hundred thirty-one thousand, two hundred twelve".