21776222 has 16 divisors (see below), whose sum is σ = 35290080. Its totient is φ = 10018272.

The previous prime is 21776221. The next prime is 21776233. The reversal of 21776222 is 22267712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21776221) 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 7 ways as a sum of consecutive naturals, for example, 8168 + ... + 10500.

It is an arithmetic number, because the mean of its divisors is an integer number (2205630).

Almost surely, 2^21776222 is an apocalyptic number.

It is a pronic number, being equal to 4666×4667.

21776222 is a deficient number, since it is larger than the sum of its proper divisors (13513858).

21776222 is a wasteful number, since it uses less digits than its factorization.

21776222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707.

The product of its digits is 4704, while the sum is 29.

The square root of 21776222 is about 4666.4999732133. The cubic root of 21776222 is about 279.2506408500.

The spelling of 21776222 in words is "twenty-one million, seven hundred seventy-six thousand, two hundred twenty-two".