121221265 has 8 divisors (see below), whose sum is σ = 158689728. Its totient is φ = 88160880.

The previous prime is 121221241. The next prime is 121221283. The reversal of 121221265 is 562122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221265 - 2¹⁹ = 120696977 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1101957 + ... + 1102066.

It is an arithmetic number, because the mean of its divisors is an integer number (19836216).

Almost surely, 2^121221265 is an apocalyptic number.

It is an amenable number.

121221265 is a deficient number, since it is larger than the sum of its proper divisors (37468463).

121221265 is a wasteful number, since it uses less digits than its factorization.

121221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204039.

The product of its digits is 480, while the sum is 22.

The square root of 121221265 is about 11010.0529063216. The cubic root of 121221265 is about 494.9100472535.

Adding to 121221265 its reverse (562122121), we get a palindrome (683343386).

The spelling of 121221265 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred sixty-five".