6215122221 has 96 divisors (see below), whose sum is σ = 10949603328. Its totient is φ = 3098309760.

The previous prime is 6215122217. The next prime is 6215122229. The reversal of 6215122221 is 1222215126.

It is not a de Polignac number, because 6215122221 - 2² = 6215122217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6215122191 and 6215122200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6215122229) 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 in 95 ways as a sum of consecutive naturals, for example, 4027176 + ... + 4028718.

It is an arithmetic number, because the mean of its divisors is an integer number (114058368).

Almost surely, 2^6215122221 is an apocalyptic number.

It is an amenable number.

6215122221 is a deficient number, since it is larger than the sum of its proper divisors (4734481107).

6215122221 is a wasteful number, since it uses less digits than its factorization.

6215122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1664 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 6215122221 is about 78836.0464571886. The cubic root of 6215122221 is about 1838.5829335281.

Adding to 6215122221 its reverse (1222215126), we get a palindrome (7437337347).

The spelling of 6215122221 in words is "six billion, two hundred fifteen million, one hundred twenty-two thousand, two hundred twenty-one".