121391444 has 12 divisors (see below), whose sum is σ = 213067764. Its totient is φ = 60514944.

The previous prime is 121391429. The next prime is 121391449. The reversal of 121391444 is 444193121.

It can be written as a sum of positive squares in 2 ways, for example, as 47087044 + 74304400 = 6862^2 + 8620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121391449) 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, 43679 + ... + 46374.

It is an arithmetic number, because the mean of its divisors is an integer number (17755647).

Almost surely, 2^121391444 is an apocalyptic number.

It is an amenable number.

121391444 is a deficient number, since it is larger than the sum of its proper divisors (91676320).

121391444 is a wasteful number, since it uses less digits than its factorization.

121391444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90394 (or 90392 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 121391444 is about 11017.7785419748. The cubic root of 121391444 is about 495.1415355565.

The spelling of 121391444 in words is "one hundred twenty-one million, three hundred ninety-one thousand, four hundred forty-four".