121596021 has 12 divisors (see below), whose sum is σ = 177379020. Its totient is φ = 80260800.

The previous prime is 121596011. The next prime is 121596047. The reversal of 121596021 is 120695121.

121596021 is a `hidden beast` number, since 1 + 2 + 1 + 59 + 602 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107868996 + 13727025 = 10386^2 + 3705^2 .

It is not a de Polignac number, because 121596021 - 2⁷ = 121595893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121596001) 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 11 ways as a sum of consecutive naturals, for example, 65976 + ... + 67793.

It is an arithmetic number, because the mean of its divisors is an integer number (14781585).

Almost surely, 2^121596021 is an apocalyptic number.

It is an amenable number.

121596021 is a deficient number, since it is larger than the sum of its proper divisors (55782999).

121596021 is a wasteful number, since it uses less digits than its factorization.

121596021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133876 (or 133873 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 121596021 is about 11027.0585833213. The cubic root of 121596021 is about 495.4195280217.

The spelling of 121596021 in words is "one hundred twenty-one million, five hundred ninety-six thousand, twenty-one".