21442303061 has 2 divisors, whose sum is σ = 21442303062. Its totient is φ = 21442303060.

The previous prime is 21442303039. The next prime is 21442303117. The reversal of 21442303061 is 16030324412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13232130961 + 8210172100 = 115031^2 + 90610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442303061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21442303061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442303261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721151530 + 10721151531.

It is an arithmetic number, because the mean of its divisors is an integer number (10721151531).

Almost surely, 2^21442303061 is an apocalyptic number.

It is an amenable number.

21442303061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442303061 is an equidigital number, since it uses as much as digits as its factorization.

21442303061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21442303061 its reverse (16030324412), we get a palindrome (37472627473).

The spelling of 21442303061 in words is "twenty-one billion, four hundred forty-two million, three hundred three thousand, sixty-one".