121731412 has 12 divisors (see below), whose sum is σ = 232396416. Its totient is φ = 55332440.

The previous prime is 121731403. The next prime is 121731413. The reversal of 121731412 is 214137121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121731413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383268 + ... + 1383355.

It is an arithmetic number, because the mean of its divisors is an integer number (19366368).

Almost surely, 2^121731412 is an apocalyptic number.

It is an amenable number.

121731412 is a deficient number, since it is larger than the sum of its proper divisors (110665004).

121731412 is a wasteful number, since it uses less digits than its factorization.

121731412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766638 (or 2766636 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 121731412 is about 11033.1959105238. The cubic root of 121731412 is about 495.6033346550.

Adding to 121731412 its reverse (214137121), we get a palindrome (335868533).

The spelling of 121731412 in words is "one hundred twenty-one million, seven hundred thirty-one thousand, four hundred twelve".