2147221 has 8 divisors (see below), whose sum is σ = 2227104. Its totient is φ = 2068560.

The previous prime is 2147213. The next prime is 2147231. The reversal of 2147221 is 1227412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2147221 - 2³ = 2147213 is a prime.

It is a super-2 number, since 2×2147221² = 9221116045682, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2147231) 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, 4626 + ... + 5068.

It is an arithmetic number, because the mean of its divisors is an integer number (278388).

2^2147221 is an apocalyptic number.

It is an amenable number.

2147221 is a deficient number, since it is larger than the sum of its proper divisors (79883).

2147221 is a wasteful number, since it uses less digits than its factorization.

2147221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its digits is 224, while the sum is 19.

The square root of 2147221 is about 1465.3398923117. The cubic root of 2147221 is about 129.0106555307.

The spelling of 2147221 in words is "two million, one hundred forty-seven thousand, two hundred twenty-one".