2867221 has 16 divisors (see below), whose sum is σ = 3447808. Its totient is φ = 2332800.

The previous prime is 2867219. The next prime is 2867231. The reversal of 2867221 is 1227682.

It is a 4-Lehmer number, since φ(2867221) divides (2867221-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 2867221 - 2¹ = 2867219 is a prime.

It is a nialpdrome in base 12.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 2867221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2867231) 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, 15751 + ... + 15931.

It is an arithmetic number, because the mean of its divisors is an integer number (215488).

It is a Poulet number, since it divides 2^2867220-1.

2^2867221 is an apocalyptic number.

It is an amenable number.

2867221 is a deficient number, since it is larger than the sum of its proper divisors (580587).

2867221 is a wasteful number, since it uses less digits than its factorization.

2867221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 2688, while the sum is 28.

The square root of 2867221 is about 1693.2870400496. The cubic root of 2867221 is about 142.0649871155.

The spelling of 2867221 in words is "two million, eight hundred sixty-seven thousand, two hundred twenty-one".