6201355221 has 20 divisors (see below), whose sum is σ = 9415625164. Its totient is φ = 4066459200.

The previous prime is 6201355219. The next prime is 6201355229. The reversal of 6201355221 is 1225531026.

It is a happy number.

6201355221 is a `hidden beast` number, since 6 + 2 + 0 + 135 + 522 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 417752721 + 5783602500 = 20439^2 + 76050^2 .

It is not a de Polignac number, because 6201355221 - 2¹ = 6201355219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6201355229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 622600 + ... + 632481.

Almost surely, 2^6201355221 is an apocalyptic number.

6201355221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6201355221 is a deficient number, since it is larger than the sum of its proper divisors (3214269943).

6201355221 is a wasteful number, since it uses less digits than its factorization.

6201355221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255154 (or 1255145 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6201355221 is about 78748.6839318601. The cubic root of 6201355221 is about 1837.2243931494.

Adding to 6201355221 its reverse (1225531026), we get a palindrome (7426886247).

The spelling of 6201355221 in words is "six billion, two hundred one million, three hundred fifty-five thousand, two hundred twenty-one".