21010222241 has 2 divisors, whose sum is σ = 21010222242. Its totient is φ = 21010222240.

The previous prime is 21010222237. The next prime is 21010222271. The reversal of 21010222241 is 14222201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12156165025 + 8854057216 = 110255^2 + 94096^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010222241 - 2² = 21010222237 is a prime.

It is a super-2 number, since 2×21010222241² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21010222271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505111120 + 10505111121.

It is an arithmetic number, because the mean of its divisors is an integer number (10505111121).

Almost surely, 2^21010222241 is an apocalyptic number.

It is an amenable number.

21010222241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010222241 is an equidigital number, since it uses as much as digits as its factorization.

21010222241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21010222241 its reverse (14222201012), we get a palindrome (35232423253).

The spelling of 21010222241 in words is "twenty-one billion, ten million, two hundred twenty-two thousand, two hundred forty-one".