121525221 has 8 divisors (see below), whose sum is σ = 165481344. Its totient is φ = 79292960.

The previous prime is 121525211. The next prime is 121525223. The reversal of 121525221 is 122525121.

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

It is a cyclic number.

It is not a de Polignac number, because 121525221 - 2⁷ = 121525093 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 (121525223) 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, 430800 + ... + 431081.

It is an arithmetic number, because the mean of its divisors is an integer number (20685168).

Almost surely, 2^121525221 is an apocalyptic number.

It is an amenable number.

121525221 is a deficient number, since it is larger than the sum of its proper divisors (43956123).

121525221 is an equidigital number, since it uses as much as digits as its factorization.

121525221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861931.

The product of its digits is 400, while the sum is 21.

The square root of 121525221 is about 11023.8478309527. The cubic root of 121525221 is about 495.3233557068.

The spelling of 121525221 in words is "one hundred twenty-one million, five hundred twenty-five thousand, two hundred twenty-one".