121319818 has 16 divisors (see below), whose sum is σ = 193346280. Its totient is φ = 56984256.

The previous prime is 121319801. The next prime is 121319819. The reversal of 121319818 is 818913121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 97476129 + 23843689 = 9873^2 + 4883^2 .

It is not an unprimeable number, because it can be changed into a prime (121319819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26121 + ... + 30412.

Almost surely, 2^121319818 is an apocalyptic number.

121319818 is a deficient number, since it is larger than the sum of its proper divisors (72026462).

121319818 is a wasteful number, since it uses less digits than its factorization.

121319818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56601.

The product of its digits is 3456, while the sum is 34.

The square root of 121319818 is about 11014.5275885986. The cubic root of 121319818 is about 495.0441316977.

The spelling of 121319818 in words is "one hundred twenty-one million, three hundred nineteen thousand, eight hundred eighteen".