2221687 has 4 divisors (see below), whose sum is σ = 2392600. Its totient is φ = 2050776.

The previous prime is 2221673. The next prime is 2221699. The reversal of 2221687 is 7861222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7861222 = 2 ⋅3930611.

It is not a de Polignac number, because 2221687 - 2¹⁵ = 2188919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221657) 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 3 ways as a sum of consecutive naturals, for example, 85437 + ... + 85462.

It is an arithmetic number, because the mean of its divisors is an integer number (598150).

2^2221687 is an apocalyptic number.

2221687 is a deficient number, since it is larger than the sum of its proper divisors (170913).

2221687 is a wasteful number, since it uses less digits than its factorization.

2221687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170912.

The product of its digits is 2688, while the sum is 28.

The square root of 2221687 is about 1490.5324551985. The cubic root of 2221687 is about 130.4851105770.

The spelling of 2221687 in words is "two million, two hundred twenty-one thousand, six hundred eighty-seven".