121811345 has 4 divisors (see below), whose sum is σ = 146173620. Its totient is φ = 97449072.

The previous prime is 121811323. The next prime is 121811351. The reversal of 121811345 is 543118121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29343889 + 92467456 = 5417^2 + 9616^2 .

It is a cyclic number.

It is not a de Polignac number, because 121811345 - 2²⁴ = 105034129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12181130 + ... + 12181139.

It is an arithmetic number, because the mean of its divisors is an integer number (36543405).

Almost surely, 2^121811345 is an apocalyptic number.

It is an amenable number.

121811345 is a deficient number, since it is larger than the sum of its proper divisors (24362275).

121811345 is an equidigital number, since it uses as much as digits as its factorization.

121811345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24362274.

The product of its digits is 960, while the sum is 26.

The square root of 121811345 is about 11036.8177025808. The cubic root of 121811345 is about 495.7117876089.

Adding to 121811345 its reverse (543118121), we get a palindrome (664929466).

The spelling of 121811345 in words is "one hundred twenty-one million, eight hundred eleven thousand, three hundred forty-five".