6172026221 has 4 divisors (see below), whose sum is σ = 6172893372. Its totient is φ = 6171159072.

The previous prime is 6172026197. The next prime is 6172026269. The reversal of 6172026221 is 1226202716.

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 2451636196 + 3720390025 = 49514^2 + 60995^2 .

It is a cyclic number.

It is not a de Polignac number, because 6172026221 - 2¹⁸ = 6171764077 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 (6172026281) 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, 422810 + ... + 437163.

It is an arithmetic number, because the mean of its divisors is an integer number (1543223343).

Almost surely, 2^6172026221 is an apocalyptic number.

It is an amenable number.

6172026221 is a deficient number, since it is larger than the sum of its proper divisors (867151).

6172026221 is an equidigital number, since it uses as much as digits as its factorization.

6172026221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867150.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 6172026221 is about 78562.2442462026. The cubic root of 6172026221 is about 1834.3234613711.

Adding to 6172026221 its reverse (1226202716), we get a palindrome (7398228937).

The spelling of 6172026221 in words is "six billion, one hundred seventy-two million, twenty-six thousand, two hundred twenty-one".