2587221 has 48 divisors (see below), whose sum is σ = 4801920. Its totient is φ = 1364688.

The previous prime is 2587217. The next prime is 2587253. The reversal of 2587221 is 1227852.

It is not a de Polignac number, because 2587221 - 2² = 2587217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2587271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 199011 + ... + 199023.

It is an arithmetic number, because the mean of its divisors is an integer number (100040).

2^2587221 is an apocalyptic number.

2587221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2587221 is a deficient number, since it is larger than the sum of its proper divisors (2214699).

2587221 is an frugal number, since it uses more digits than its factorization.

2587221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 23 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2587221 is about 1608.4840689295. The cubic root of 2587221 is about 137.2812344930.

The spelling of 2587221 in words is "two million, five hundred eighty-seven thousand, two hundred twenty-one".