22606821 has 24 divisors (see below), whose sum is σ = 34856640. Its totient is φ = 14069376.

The previous prime is 22606813. The next prime is 22606841. The reversal of 22606821 is 12860622.

It is not a de Polignac number, because 22606821 - 2³ = 22606813 is a prime.

It is a super-2 number, since 2×22606821² = 1022136711452082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22606811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20736 + ... + 21798.

It is an arithmetic number, because the mean of its divisors is an integer number (1452360).

Almost surely, 2^22606821 is an apocalyptic number.

It is an amenable number.

22606821 is a deficient number, since it is larger than the sum of its proper divisors (12249819).

22606821 is a wasteful number, since it uses less digits than its factorization.

22606821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 22606821 is about 4754.6630795462. The cubic root of 22606821 is about 282.7568697658.

The spelling of 22606821 in words is "twenty-two million, six hundred six thousand, eight hundred twenty-one".