7221019806 has 512 divisors, whose sum is σ = 23224320000. Its totient is φ = 1601233920.

The previous prime is 7221019801. The next prime is 7221019811. The reversal of 7221019806 is 6089101227.

It is an interprime number because it is at equal distance from previous prime (7221019801) and next prime (7221019811).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221019801) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 81135010 + ... + 81135098.

It is an arithmetic number, because the mean of its divisors is an integer number (45360000).

Almost surely, 2^7221019806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221019806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11612160000).

7221019806 is an abundant number, since it is smaller than the sum of its proper divisors (16003300194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221019806 is a wasteful number, since it uses less digits than its factorization.

7221019806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 7221019806 is about 84976.5838687341. The cubic root of 7221019806 is about 1932.8560546051.

The spelling of 7221019806 in words is "seven billion, two hundred twenty-one million, nineteen thousand, eight hundred six".