21221422433 has 2 divisors, whose sum is σ = 21221422434. Its totient is φ = 21221422432.

The previous prime is 21221422427. The next prime is 21221422451. The reversal of 21221422433 is 33422412212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17844417889 + 3377004544 = 133583^2 + 58112^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221422433 - 2⁸ = 21221422177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221422333) 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 as a sum of consecutive naturals, namely, 10610711216 + 10610711217.

It is an arithmetic number, because the mean of its divisors is an integer number (10610711217).

Almost surely, 2^21221422433 is an apocalyptic number.

It is an amenable number.

21221422433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221422433 is an equidigital number, since it uses as much as digits as its factorization.

21221422433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 26.

Adding to 21221422433 its reverse (33422412212), we get a palindrome (54643834645).

The spelling of 21221422433 in words is "twenty-one billion, two hundred twenty-one million, four hundred twenty-two thousand, four hundred thirty-three".