221433947281 has 2 divisors, whose sum is σ = 221433947282. Its totient is φ = 221433947280.

The previous prime is 221433947243. The next prime is 221433947297. The reversal of 221433947281 is 182749334122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194340787281 + 27093160000 = 440841^2 + 164600^2 .

It is a cyclic number.

It is not a de Polignac number, because 221433947281 - 2⁷ = 221433947153 is a prime.

It is a super-2 number, since 2×221433947281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221433947201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110716973640 + 110716973641.

It is an arithmetic number, because the mean of its divisors is an integer number (110716973641).

Almost surely, 2^221433947281 is an apocalyptic number.

It is an amenable number.

221433947281 is a deficient number, since it is larger than the sum of its proper divisors (1).

221433947281 is an equidigital number, since it uses as much as digits as its factorization.

221433947281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 46.

The spelling of 221433947281 in words is "two hundred twenty-one billion, four hundred thirty-three million, nine hundred forty-seven thousand, two hundred eighty-one".