121778234 has 4 divisors (see below), whose sum is σ = 182667354. Its totient is φ = 60889116.

The previous prime is 121778233. The next prime is 121778287. The reversal of 121778234 is 432877121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 432877121 = 83 ⋅5215387.

It can be written as a sum of positive squares in only one way, i.e., 101103025 + 20675209 = 10055^2 + 4547^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121778194 and 121778203.

It is not an unprimeable number, because it can be changed into a prime (121778233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30444557 + ... + 30444560.

Almost surely, 2^121778234 is an apocalyptic number.

121778234 is a deficient number, since it is larger than the sum of its proper divisors (60889120).

121778234 is an equidigital number, since it uses as much as digits as its factorization.

121778234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60889119.

The product of its digits is 18816, while the sum is 35.

The square root of 121778234 is about 11035.3175758562. The cubic root of 121778234 is about 495.6668684201. Note that the first 3 decimals are identical.

The spelling of 121778234 in words is "one hundred twenty-one million, seven hundred seventy-eight thousand, two hundred thirty-four".