22221851 has 4 divisors (see below), whose sum is σ = 22232400. Its totient is φ = 22211304.

The previous prime is 22221847. The next prime is 22221853. The reversal of 22221851 is 15812222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22221851 - 2² = 22221847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (5558100).

Almost surely, 2^22221851 is an apocalyptic number.

22221851 is a deficient number, since it is larger than the sum of its proper divisors (10549).

22221851 is an equidigital number, since it uses as much as digits as its factorization.

22221851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10548.

The product of its digits is 640, while the sum is 23.

The square root of 22221851 is about 4714.0058336833. The cubic root of 22221851 is about 281.1426562538.

The spelling of 22221851 in words is "twenty-two million, two hundred twenty-one thousand, eight hundred fifty-one".