22221687 has 4 divisors (see below), whose sum is σ = 29628920. Its totient is φ = 14814456.

The previous prime is 22221649. The next prime is 22221691. The reversal of 22221687 is 78612222.

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

It is not a de Polignac number, because 22221687 - 2⁷ = 22221559 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 (22221487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703612 + ... + 3703617.

It is an arithmetic number, because the mean of its divisors is an integer number (7407230).

Almost surely, 2^22221687 is an apocalyptic number.

22221687 is a deficient number, since it is larger than the sum of its proper divisors (7407233).

22221687 is an equidigital number, since it uses as much as digits as its factorization.

22221687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7407232.

The product of its digits is 5376, while the sum is 30.

The square root of 22221687 is about 4713.9884386791. The cubic root of 22221687 is about 281.1419646296.

The spelling of 22221687 in words is "twenty-two million, two hundred twenty-one thousand, six hundred eighty-seven".