121521646 has 4 divisors (see below), whose sum is σ = 182282472. Its totient is φ = 60760822.

The previous prime is 121521641. The next prime is 121521667. The reversal of 121521646 is 646125121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121521641) 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 as a sum of consecutive naturals, namely, 30380410 + ... + 30380413.

It is an arithmetic number, because the mean of its divisors is an integer number (45570618).

Almost surely, 2^121521646 is an apocalyptic number.

121521646 is a deficient number, since it is larger than the sum of its proper divisors (60760826).

121521646 is an equidigital number, since it uses as much as digits as its factorization.

121521646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60760825.

The product of its digits is 2880, while the sum is 28.

The square root of 121521646 is about 11023.6856812955. The cubic root of 121521646 is about 495.3184985577.

Adding to 121521646 its reverse (646125121), we get a palindrome (767646767).

The spelling of 121521646 in words is "one hundred twenty-one million, five hundred twenty-one thousand, six hundred forty-six".