121684138 has 8 divisors (see below), whose sum is σ = 185026788. Its totient is φ = 60008544.

The previous prime is 121684133. The next prime is 121684139. The reversal of 121684138 is 831486121.

It can be written as a sum of positive squares in 2 ways, for example, as 107599129 + 14085009 = 10373^2 + 3753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (121684133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416581 + ... + 416872.

Almost surely, 2^121684138 is an apocalyptic number.

121684138 is a deficient number, since it is larger than the sum of its proper divisors (63342650).

121684138 is an equidigital number, since it uses as much as digits as its factorization.

121684138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833528.

The product of its digits is 9216, while the sum is 34.

The square root of 121684138 is about 11031.0533495220. The cubic root of 121684138 is about 495.5391710312.

The spelling of 121684138 in words is "one hundred twenty-one million, six hundred eighty-four thousand, one hundred thirty-eight".