6221626121 has 2 divisors, whose sum is σ = 6221626122. Its totient is φ = 6221626120.

The previous prime is 6221626093. The next prime is 6221626123. The reversal of 6221626121 is 1216261226.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5280056896 + 941569225 = 72664^2 + 30685^2 .

It is a cyclic number.

It is not a de Polignac number, because 6221626121 - 2¹⁸ = 6221363977 is a prime.

Together with 6221626123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6221626123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3110813060 + 3110813061.

It is an arithmetic number, because the mean of its divisors is an integer number (3110813061).

Almost surely, 2^6221626121 is an apocalyptic number.

It is an amenable number.

6221626121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6221626121 is an equidigital number, since it uses as much as digits as its factorization.

6221626121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 6221626121 is about 78877.2852030291. The cubic root of 6221626121 is about 1839.2240467328.

Adding to 6221626121 its reverse (1216261226), we get a palindrome (7437887347).

The spelling of 6221626121 in words is "six billion, two hundred twenty-one million, six hundred twenty-six thousand, one hundred twenty-one".