869971221 has 48 divisors (see below), whose sum is σ = 1516278400. Its totient is φ = 469545984.

The previous prime is 869971213. The next prime is 869971231. The reversal of 869971221 is 122179968.

It is not a de Polignac number, because 869971221 - 2³ = 869971213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869971211) 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 47 ways as a sum of consecutive naturals, for example, 488685 + ... + 490461.

Almost surely, 2^869971221 is an apocalyptic number.

It is an amenable number.

869971221 is a deficient number, since it is larger than the sum of its proper divisors (646307179).

869971221 is a wasteful number, since it uses less digits than its factorization.

869971221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218 (or 2215 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 869971221 is about 29495.2745537315. The cubic root of 869971221 is about 954.6297445393.

The spelling of 869971221 in words is "eight hundred sixty-nine million, nine hundred seventy-one thousand, two hundred twenty-one".