871354255225221 has 12 divisors (see below), whose sum is σ = 1258633326220972. Its totient is φ = 580897984608576.

The previous prime is 871354255225009. The next prime is 871354255225301. The reversal of 871354255225221 is 122522552453178.

871354255225221 is a `hidden beast` number, since 8 + 7 + 1 + 3 + 5 + 42 + 5 + 522 + 52 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 562036737094596 + 309317518130625 = 23707314^2 + 17587425^2 .

It is not a de Polignac number, because 871354255225221 - 2¹¹ = 871354255223173 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 (871354255229221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 403213186 + ... + 405368451.

Almost surely, 2^{871354255225221} is an apocalyptic number.

It is an amenable number.

871354255225221 is a deficient number, since it is larger than the sum of its proper divisors (387279070995751).

871354255225221 is a wasteful number, since it uses less digits than its factorization.

871354255225221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808701380 (or 808701377 counting only the distinct ones).

The product of its digits is 13440000, while the sum is 54.

The spelling of 871354255225221 in words is "eight hundred seventy-one trillion, three hundred fifty-four billion, two hundred fifty-five million, two hundred twenty-five thousand, two hundred twenty-one".