1221455273 has 8 divisors (see below), whose sum is σ = 1315677696. Its totient is φ = 1130659200.

The previous prime is 1221455203. The next prime is 1221455281. The reversal of 1221455273 is 3725541221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221455273 - 2¹² = 1221451177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221455203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855848 + ... + 857273.

It is an arithmetic number, because the mean of its divisors is an integer number (164459712).

Almost surely, 2^1221455273 is an apocalyptic number.

It is an amenable number.

1221455273 is a deficient number, since it is larger than the sum of its proper divisors (94222423).

1221455273 is a wasteful number, since it uses less digits than its factorization.

1221455273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713175.

The product of its digits is 16800, while the sum is 32.

The square root of 1221455273 is about 34949.3243568456. The cubic root of 1221455273 is about 1068.9544253899.

Adding to 1221455273 its reverse (3725541221), we get a palindrome (4946996494).

The spelling of 1221455273 in words is "one billion, two hundred twenty-one million, four hundred fifty-five thousand, two hundred seventy-three".