810074515221 has 20 divisors (see below), whose sum is σ = 1210166496000. Its totient is φ = 540025049736.

The previous prime is 810074515199. The next prime is 810074515223. The reversal of 810074515221 is 122515470018.

It is a happy number.

810074515221 is a `hidden beast` number, since 8 + 10 + 0 + 74 + 51 + 522 + 1 = 666.

It is not a de Polignac number, because 810074515221 - 2⁵ = 810074515189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810074515223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1654540 + ... + 2087498.

It is an arithmetic number, because the mean of its divisors is an integer number (60508324800).

Almost surely, 2^810074515221 is an apocalyptic number.

810074515221 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

810074515221 is a deficient number, since it is larger than the sum of its proper divisors (400091980779).

810074515221 is a wasteful number, since it uses less digits than its factorization.

810074515221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456070 (or 456061 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

Adding to 810074515221 its reverse (122515470018), we get a palindrome (932589985239).

The spelling of 810074515221 in words is "eight hundred ten billion, seventy-four million, five hundred fifteen thousand, two hundred twenty-one".