21222606 has 32 divisors (see below), whose sum is σ = 45826560. Its totient is φ = 6532064.

The previous prime is 21222587. The next prime is 21222611. The reversal of 21222606 is 60622212.

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, 1351 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (1432080).

Almost surely, 2^21222606 is an apocalyptic number.

21222606 is an abundant number, since it is smaller than the sum of its proper divisors (24603954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222606 is a wasteful number, since it uses less digits than its factorization.

21222606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21222606 is about 4606.7999739515. The cubic root of 21222606 is about 276.8638393829.

Adding to 21222606 its reverse (60622212), we get a palindrome (81844818).

The spelling of 21222606 in words is "twenty-one million, two hundred twenty-two thousand, six hundred six".