121521606 has 16 divisors (see below), whose sum is σ = 255835200. Its totient is φ = 38375208.

The previous prime is 121521583. The next prime is 121521607. The reversal of 121521606 is 606125121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121521607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532876 + ... + 533103.

It is an arithmetic number, because the mean of its divisors is an integer number (15989700).

Almost surely, 2^121521606 is an apocalyptic number.

121521606 is an abundant number, since it is smaller than the sum of its proper divisors (134313594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121521606 is a wasteful number, since it uses less digits than its factorization.

121521606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066003.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 121521606 is about 11023.6838670201. The cubic root of 121521606 is about 495.3184442115.

Adding to 121521606 its reverse (606125121), we get a palindrome (727646727).

The spelling of 121521606 in words is "one hundred twenty-one million, five hundred twenty-one thousand, six hundred six".