21607222 has 32 divisors (see below), whose sum is σ = 40142592. Its totient is φ = 8493984.

The previous prime is 21607219. The next prime is 21607231. The reversal of 21607222 is 22270612.

It is a junction number, because it is equal to n+sod(n) for n = 21607193 and 21607202.

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 15 ways as a sum of consecutive naturals, for example, 41053 + ... + 41575.

It is an arithmetic number, because the mean of its divisors is an integer number (1254456).

Almost surely, 2^21607222 is an apocalyptic number.

21607222 is a deficient number, since it is larger than the sum of its proper divisors (18535370).

21607222 is a wasteful number, since it uses less digits than its factorization.

21607222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21607222 is about 4648.3569140074. The cubic root of 21607222 is about 278.5263650346.

Adding to 21607222 its reverse (22270612), we get a palindrome (43877834).

The spelling of 21607222 in words is "twenty-one million, six hundred seven thousand, two hundred twenty-two".