2143221 has 8 divisors (see below), whose sum is σ = 2874144. Its totient is φ = 1420560.

The previous prime is 2143217. The next prime is 2143223. The reversal of 2143221 is 1223412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2143221 - 2² = 2143217 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 4⁷ + 3¹³ + 2¹³ + 2¹⁹ + 1 .

It is a self number, because there is not a number n which added to its sum of digits gives 2143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1431 + ... + 2516.

It is an arithmetic number, because the mean of its divisors is an integer number (359268).

2^2143221 is an apocalyptic number.

It is an amenable number.

2143221 is a deficient number, since it is larger than the sum of its proper divisors (730923).

2143221 is a wasteful number, since it uses less digits than its factorization.

2143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131.

The product of its digits is 96, while the sum is 15.

The square root of 2143221 is about 1463.9743850218. The cubic root of 2143221 is about 128.9304955790.

Adding to 2143221 its reverse (1223412), we get a palindrome (3366633).

The spelling of 2143221 in words is "two million, one hundred forty-three thousand, two hundred twenty-one".