19994121 has 40 divisors (see below), whose sum is σ = 34499520. Its totient is φ = 11303712.

The previous prime is 19994113. The next prime is 19994123. The reversal of 19994121 is 12149991.

It is not a de Polignac number, because 19994121 - 2³ = 19994113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19994123) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 101395 + ... + 101591.

It is an arithmetic number, because the mean of its divisors is an integer number (862488).

Almost surely, 2^19994121 is an apocalyptic number.

It is an amenable number.

19994121 is a deficient number, since it is larger than the sum of its proper divisors (14505399).

19994121 is a wasteful number, since it uses less digits than its factorization.

19994121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 386 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 19994121 is about 4471.4786145077. The cubic root of 19994121 is about 271.4151622844.

The spelling of 19994121 in words is "nineteen million, nine hundred ninety-four thousand, one hundred twenty-one".