6251112221 has 4 divisors (see below), whose sum is σ = 6263640000. Its totient is φ = 6238584444.

The previous prime is 6251112193. The next prime is 6251112253. The reversal of 6251112221 is 1222111526.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6251112221 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 (6251118221) 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 3 ways as a sum of consecutive naturals, for example, 6263141 + ... + 6264138.

It is an arithmetic number, because the mean of its divisors is an integer number (1565910000).

Almost surely, 2^6251112221 is an apocalyptic number.

It is an amenable number.

6251112221 is a deficient number, since it is larger than the sum of its proper divisors (12527779).

6251112221 is a wasteful number, since it uses less digits than its factorization.

6251112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12527778.

The product of its digits is 480, while the sum is 23.

The square root of 6251112221 is about 79063.9754945323. The cubic root of 6251112221 is about 1842.1250083646.

Adding to 6251112221 its reverse (1222111526), we get a palindrome (7473223747).

The spelling of 6251112221 in words is "six billion, two hundred fifty-one million, one hundred twelve thousand, two hundred twenty-one".