121811361 has 16 divisors (see below), whose sum is σ = 185771904. Its totient is φ = 69548544.

The previous prime is 121811359. The next prime is 121811419. The reversal of 121811361 is 163118121.

It is not a de Polignac number, because 121811361 - 2¹ = 121811359 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121811351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45681 + ... + 48273.

It is an arithmetic number, because the mean of its divisors is an integer number (11610744).

Almost surely, 2^121811361 is an apocalyptic number.

It is an amenable number.

121811361 is a deficient number, since it is larger than the sum of its proper divisors (63960543).

121811361 is a wasteful number, since it uses less digits than its factorization.

121811361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840.

The product of its digits is 288, while the sum is 24.

The square root of 121811361 is about 11036.8184274274. The cubic root of 121811361 is about 495.7118093129.

Adding to 121811361 its reverse (163118121), we get a palindrome (284929482).

The spelling of 121811361 in words is "one hundred twenty-one million, eight hundred eleven thousand, three hundred sixty-one".