121991342 has 32 divisors (see below), whose sum is σ = 208552320. Its totient is φ = 53008480.

The previous prime is 121991341. The next prime is 121991369. The reversal of 121991342 is 243199121.

It is a junction number, because it is equal to n+sod(n) for n = 121991299 and 121991308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121991341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67373 + ... + 69159.

It is an arithmetic number, because the mean of its divisors is an integer number (6517260).

Almost surely, 2^121991342 is an apocalyptic number.

121991342 is a deficient number, since it is larger than the sum of its proper divisors (86560978).

121991342 is a wasteful number, since it uses less digits than its factorization.

121991342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 3888, while the sum is 32.

The square root of 121991342 is about 11044.9690809889. The cubic root of 121991342 is about 495.9558336280.

The spelling of 121991342 in words is "one hundred twenty-one million, nine hundred ninety-one thousand, three hundred forty-two".