2911221 has 20 divisors (see below), whose sum is σ = 4398592. Its totient is φ = 1918728.

The previous prime is 2911211. The next prime is 2911243. The reversal of 2911221 is 1221192.

It is not a de Polignac number, because 2911221 - 2⁵ = 2911189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2911194 and 2911203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2911211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10146 + ... + 10428.

2^2911221 is an apocalyptic number.

It is an amenable number.

2911221 is a deficient number, since it is larger than the sum of its proper divisors (1487371).

2911221 is a wasteful number, since it uses less digits than its factorization.

2911221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 413 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 2911221 is about 1706.2300548285. The cubic root of 2911221 is about 142.7880047830.

The spelling of 2911221 in words is "two million, nine hundred eleven thousand, two hundred twenty-one".