21650222 has 16 divisors (see below), whose sum is σ = 36968832. Its totient is φ = 9412920.

The previous prime is 21650219. The next prime is 21650249. The reversal of 21650222 is 22205612.

It is a super-2 number, since 2×21650222² = 937464225298568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21650194 and 21650203.

It is a congruent number.

It is an unprimeable number.

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, 20888 + ... + 21899.

It is an arithmetic number, because the mean of its divisors is an integer number (2310552).

Almost surely, 2^21650222 is an apocalyptic number.

21650222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21650222 is a deficient number, since it is larger than the sum of its proper divisors (15318610).

21650222 is a wasteful number, since it uses less digits than its factorization.

21650222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42823.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21650222 is about 4652.9799053940. The cubic root of 21650222 is about 278.7110054242.

Adding to 21650222 its reverse (22205612), we get a palindrome (43855834).

The spelling of 21650222 in words is "twenty-one million, six hundred fifty thousand, two hundred twenty-two".