1221303401 has 2 divisors, whose sum is σ = 1221303402. Its totient is φ = 1221303400.

The previous prime is 1221303389. The next prime is 1221303439. The reversal of 1221303401 is 1043031221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1200691801 + 20611600 = 34651^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221303401 - 2¹⁰ = 1221302377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221303401.

It is not a weakly prime, because it can be changed into another prime (1221303491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610651700 + 610651701.

It is an arithmetic number, because the mean of its divisors is an integer number (610651701).

Almost surely, 2^1221303401 is an apocalyptic number.

It is an amenable number.

1221303401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221303401 is an equidigital number, since it uses as much as digits as its factorization.

1221303401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221303401 is about 34947.1515434377. The cubic root of 1221303401 is about 1068.9101200494.

Adding to 1221303401 its reverse (1043031221), we get a palindrome (2264334622).

The spelling of 1221303401 in words is "one billion, two hundred twenty-one million, three hundred three thousand, four hundred one".