2221787 has 4 divisors (see below), whose sum is σ = 2255016. Its totient is φ = 2188560.

The previous prime is 2221771. The next prime is 2221789. The reversal of 2221787 is 7871222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2221787 - 2⁴ = 2221771 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221789) 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, 16514 + ... + 16647.

It is an arithmetic number, because the mean of its divisors is an integer number (563754).

2^2221787 is an apocalyptic number.

2221787 is a deficient number, since it is larger than the sum of its proper divisors (33229).

2221787 is an equidigital number, since it uses as much as digits as its factorization.

2221787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33228.

The product of its digits is 3136, while the sum is 29.

The square root of 2221787 is about 1490.5659998806. The cubic root of 2221787 is about 130.4870682958.

The spelling of 2221787 in words is "two million, two hundred twenty-one thousand, seven hundred eighty-seven".