121391404 has 12 divisors (see below), whose sum is σ = 215606104. Its totient is φ = 59789664.

The previous prime is 121391383. The next prime is 121391429. The reversal of 121391404 is 404193121.

It is a happy number.

It is an unprimeable number.

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, 226209 + ... + 226744.

Almost surely, 2^121391404 is an apocalyptic number.

It is an amenable number.

121391404 is a deficient number, since it is larger than the sum of its proper divisors (94214700).

121391404 is a wasteful number, since it uses less digits than its factorization.

121391404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453024 (or 453022 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 121391404 is about 11017.7767267267. The cubic root of 121391404 is about 495.1414811714.

The spelling of 121391404 in words is "one hundred twenty-one million, three hundred ninety-one thousand, four hundred four".