1221248195 has 16 divisors (see below), whose sum is σ = 1489257120. Its totient is φ = 961196544.

The previous prime is 1221248191. The next prime is 1221248213. The reversal of 1221248195 is 5918421221.

It is a cyclic number.

It is not a de Polignac number, because 1221248195 - 2² = 1221248191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221248191) 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 in 15 ways as a sum of consecutive naturals, for example, 336209 + ... + 339821.

It is an arithmetic number, because the mean of its divisors is an integer number (93078570).

Almost surely, 2^1221248195 is an apocalyptic number.

1221248195 is a deficient number, since it is larger than the sum of its proper divisors (268008925).

1221248195 is a wasteful number, since it uses less digits than its factorization.

1221248195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694.

The product of its digits is 11520, while the sum is 35.

The square root of 1221248195 is about 34946.3616847305. The cubic root of 1221248195 is about 1068.8940139938.

The spelling of 1221248195 in words is "one billion, two hundred twenty-one million, two hundred forty-eight thousand, one hundred ninety-five".