21022606 has 16 divisors (see below), whose sum is σ = 34587648. Its totient is φ = 9503800.

The previous prime is 21022597. The next prime is 21022669. The reversal of 21022606 is 60622012.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1701 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (2161728).

Almost surely, 2^21022606 is an apocalyptic number.

21022606 is a deficient number, since it is larger than the sum of its proper divisors (13565042).

21022606 is a wasteful number, since it uses less digits than its factorization.

21022606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21022606 is about 4585.0415483396. The cubic root of 21022606 is about 275.9913793429.

Adding to 21022606 its reverse (60622012), we get a palindrome (81644618).

The spelling of 21022606 in words is "twenty-one million, twenty-two thousand, six hundred six".