121135566 has 16 divisors (see below), whose sum is σ = 248180688. Its totient is φ = 39393600.

The previous prime is 121135559. The next prime is 121135571. The reversal of 121135566 is 665531121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245965 + ... + 246456.

It is an arithmetic number, because the mean of its divisors is an integer number (15511293).

Almost surely, 2^121135566 is an apocalyptic number.

121135566 is an abundant number, since it is smaller than the sum of its proper divisors (127045122).

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

121135566 is a wasteful number, since it uses less digits than its factorization.

121135566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492467.

The product of its digits is 5400, while the sum is 30.

The square root of 121135566 is about 11006.1603659042. The cubic root of 121135566 is about 494.7933919924.

Adding to 121135566 its reverse (665531121), we get a palindrome (786666687).

The spelling of 121135566 in words is "one hundred twenty-one million, one hundred thirty-five thousand, five hundred sixty-six".