6367172221 has 4 divisors (see below), whose sum is σ = 6369553372. Its totient is φ = 6364791072.

The previous prime is 6367172219. The next prime is 6367172237. The reversal of 6367172221 is 1222717636.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261468900 + 6105703321 = 16170^2 + 78139^2 .

It is a cyclic number.

It is not a de Polignac number, because 6367172221 - 2¹ = 6367172219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6367172261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186560 + ... + 1191913.

It is an arithmetic number, because the mean of its divisors is an integer number (1592388343).

Almost surely, 2^6367172221 is an apocalyptic number.

It is an amenable number.

6367172221 is a deficient number, since it is larger than the sum of its proper divisors (2381151).

6367172221 is a wasteful number, since it uses less digits than its factorization.

6367172221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381150.

The product of its digits is 42336, while the sum is 37.

The square root of 6367172221 is about 79794.5626029744. The cubic root of 6367172221 is about 1853.4556517408.

Adding to 6367172221 its reverse (1222717636), we get a palindrome (7589889857).

The spelling of 6367172221 in words is "six billion, three hundred sixty-seven million, one hundred seventy-two thousand, two hundred twenty-one".