121404021 has 8 divisors (see below), whose sum is σ = 171393984. Its totient is φ = 76175040.

The previous prime is 121404013. The next prime is 121404043. The reversal of 121404021 is 120404121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121404021 - 2³ = 121404013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121404001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1190185 + ... + 1190286.

It is an arithmetic number, because the mean of its divisors is an integer number (21424248).

Almost surely, 2^121404021 is an apocalyptic number.

It is an amenable number.

121404021 is a deficient number, since it is larger than the sum of its proper divisors (49989963).

121404021 is a wasteful number, since it uses less digits than its factorization.

121404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380491.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 121404021 is about 11018.3492865311. The cubic root of 121404021 is about 495.1586350044.

Adding to 121404021 its reverse (120404121), we get a palindrome (241808142).

It can be divided in two parts, 12140 and 4021, that added together give a palindrome (16161).

The spelling of 121404021 in words is "one hundred twenty-one million, four hundred four thousand, twenty-one".