1221432443201 has 2 divisors, whose sum is σ = 1221432443202. Its totient is φ = 1221432443200.

The previous prime is 1221432443149. The next prime is 1221432443207. The reversal of 1221432443201 is 1023442341221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1109127028801 + 112305414400 = 1053151^2 + 335120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221432443201 - 2¹⁴ = 1221432426817 is a prime.

It is a super-2 number, since 2×1221432443201² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221432443207) 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 as a sum of consecutive naturals, namely, 610716221600 + 610716221601.

It is an arithmetic number, because the mean of its divisors is an integer number (610716221601).

Almost surely, 2^{1221432443201} is an apocalyptic number.

It is an amenable number.

1221432443201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221432443201 is an equidigital number, since it uses as much as digits as its factorization.

1221432443201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 1221432443201 its reverse (1023442341221), we get a palindrome (2244874784422).

The spelling of 1221432443201 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-two million, four hundred forty-three thousand, two hundred one".