10621016221 has 2 divisors, whose sum is σ = 10621016222. Its totient is φ = 10621016220.

The previous prime is 10621016209. The next prime is 10621016227. The reversal of 10621016221 is 12261012601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8101980121 + 2519036100 = 90011^2 + 50190^2 .

It is an emirp because it is prime and its reverse (12261012601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10621016221 - 2¹⁹ = 10620491933 is a prime.

It is a super-2 number, since 2×10621016221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10621016192 and 10621016201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10621016227) 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, 5310508110 + 5310508111.

It is an arithmetic number, because the mean of its divisors is an integer number (5310508111).

Almost surely, 2^10621016221 is an apocalyptic number.

It is an amenable number.

10621016221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10621016221 is an equidigital number, since it uses as much as digits as its factorization.

10621016221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 10621016221 its reverse (12261012601), we get a palindrome (22882028822).

The spelling of 10621016221 in words is "ten billion, six hundred twenty-one million, sixteen thousand, two hundred twenty-one".