121211525 has 12 divisors (see below), whose sum is σ = 150865344. Its totient is φ = 96606000.

The previous prime is 121211459. The next prime is 121211551. The reversal of 121211525 is 525112121.

It is not a de Polignac number, because 121211525 - 2⁸ = 121211269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211497 and 121211506.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2171 + ... + 15720.

It is an arithmetic number, because the mean of its divisors is an integer number (12572112).

Almost surely, 2^121211525 is an apocalyptic number.

It is an amenable number.

121211525 is a deficient number, since it is larger than the sum of its proper divisors (29653819).

121211525 is a wasteful number, since it uses less digits than its factorization.

121211525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18172 (or 18167 counting only the distinct ones).

The product of its digits is 200, while the sum is 20.

The square root of 121211525 is about 11009.6105744027. The cubic root of 121211525 is about 494.8967917328.

Adding to 121211525 its reverse (525112121), we get a palindrome (646323646).

The spelling of 121211525 in words is "one hundred twenty-one million, two hundred eleven thousand, five hundred twenty-five".