2211921 has 32 divisors (see below), whose sum is σ = 3571200. Its totient is φ = 1347840.

The previous prime is 2211919. The next prime is 2211929. The reversal of 2211921 is 1291122.

It is not a de Polignac number, because 2211921 - 2¹ = 2211919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2211894 and 2211903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27960 + ... + 28038.

It is an arithmetic number, because the mean of its divisors is an integer number (111600).

2^2211921 is an apocalyptic number.

It is an amenable number.

2211921 is a deficient number, since it is larger than the sum of its proper divisors (1359279).

2211921 is a wasteful number, since it uses less digits than its factorization.

2211921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 160 counting only the distinct ones).

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

The square root of 2211921 is about 1487.2528366085. The cubic root of 2211921 is about 130.2936360562.

It can be divided in two parts, 22 and 11921, that multiplied together give a palindrome (262262).

The spelling of 2211921 in words is "two million, two hundred eleven thousand, nine hundred twenty-one".