121115421 has 24 divisors (see below), whose sum is σ = 202760064. Its totient is φ = 68231520.

The previous prime is 121115417. The next prime is 121115437. The reversal of 121115421 is 124511121.

121115421 is a `hidden beast` number, since 12 + 111 + 542 + 1 = 666.

It is not a de Polignac number, because 121115421 - 2² = 121115417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121115394 and 121115403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121115411) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9066 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (8448336).

Almost surely, 2^121115421 is an apocalyptic number.

It is an amenable number.

121115421 is a deficient number, since it is larger than the sum of its proper divisors (81644643).

121115421 is a wasteful number, since it uses less digits than its factorization.

121115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27161 (or 27158 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 121115421 is about 11005.2451585596. The cubic root of 121115421 is about 494.7659622132.

Adding to 121115421 its reverse (124511121), we get a palindrome (245626542).

The spelling of 121115421 in words is "one hundred twenty-one million, one hundred fifteen thousand, four hundred twenty-one".