810221444 has 6 divisors (see below), whose sum is σ = 1417887534. Its totient is φ = 405110720.

The previous prime is 810221443. The next prime is 810221491. The reversal of 810221444 is 444122018.

810221444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 667705600 + 142515844 = 25840^2 + 11938^2 .

It is not an unprimeable number, because it can be changed into a prime (810221443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101277677 + ... + 101277684.

It is an arithmetic number, because the mean of its divisors is an integer number (236314589).

Almost surely, 2^810221444 is an apocalyptic number.

It is an amenable number.

810221444 is a deficient number, since it is larger than the sum of its proper divisors (607666090).

810221444 is a wasteful number, since it uses less digits than its factorization.

810221444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202555365 (or 202555363 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 810221444 is about 28464.3890501799. The cubic root of 810221444 is about 932.2546919467.

The spelling of 810221444 in words is "eight hundred ten million, two hundred twenty-one thousand, four hundred forty-four".