1221284353 has 4 divisors (see below), whose sum is σ = 1244327508. Its totient is φ = 1198241200.

The previous prime is 1221284333. The next prime is 1221284357. The reversal of 1221284353 is 3534821221.

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 1096470769 + 124813584 = 33113^2 + 11172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221284353 - 2⁵ = 1221284321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221284357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11521498 + ... + 11521603.

It is an arithmetic number, because the mean of its divisors is an integer number (311081877).

Almost surely, 2^1221284353 is an apocalyptic number.

It is an amenable number.

1221284353 is a deficient number, since it is larger than the sum of its proper divisors (23043155).

1221284353 is an equidigital number, since it uses as much as digits as its factorization.

1221284353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23043154.

The product of its digits is 11520, while the sum is 31.

The square root of 1221284353 is about 34946.8790165874. The cubic root of 1221284353 is about 1068.9045629520.

The spelling of 1221284353 in words is "one billion, two hundred twenty-one million, two hundred eighty-four thousand, three hundred fifty-three".