121020566 has 4 divisors (see below), whose sum is σ = 181530852. Its totient is φ = 60510282.

The previous prime is 121020563. The next prime is 121020587. The reversal of 121020566 is 665020121.

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 (121020563) by changing a digit.

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 as a sum of consecutive naturals, namely, 30255140 + ... + 30255143.

It is an arithmetic number, because the mean of its divisors is an integer number (45382713).

Almost surely, 2^121020566 is an apocalyptic number.

121020566 is a deficient number, since it is larger than the sum of its proper divisors (60510286).

121020566 is an equidigital number, since it uses as much as digits as its factorization.

121020566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60510285.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121020566 is about 11000.9347784631. The cubic root of 121020566 is about 494.6367651160.

Adding to 121020566 its reverse (665020121), we get a palindrome (786040687).

The spelling of 121020566 in words is "one hundred twenty-one million, twenty thousand, five hundred sixty-six".