2827871221 has 16 divisors (see below), whose sum is σ = 3337956864. Its totient is φ = 2345367024.

The previous prime is 2827871209. The next prime is 2827871227. The reversal of 2827871221 is 1221787282.

It is not a de Polignac number, because 2827871221 - 2²⁷ = 2693653493 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 (2827871227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11695 + ... + 76108.

It is an arithmetic number, because the mean of its divisors is an integer number (208622304).

Almost surely, 2^2827871221 is an apocalyptic number.

It is an amenable number.

2827871221 is a deficient number, since it is larger than the sum of its proper divisors (510085643).

2827871221 is a wasteful number, since it uses less digits than its factorization.

2827871221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87960.

The product of its digits is 50176, while the sum is 40.

The square root of 2827871221 is about 53177.7323792581. The cubic root of 2827871221 is about 1414.1209056782.

It can be divided in two parts, 28278 and 71221, that added together give a palindrome (99499).

The spelling of 2827871221 in words is "two billion, eight hundred twenty-seven million, eight hundred seventy-one thousand, two hundred twenty-one".