21622006 has 32 divisors (see below), whose sum is σ = 38384640. Its totient is φ = 8942400.

The previous prime is 21621997. The next prime is 21622033. The reversal of 21622006 is 60022612.

It is a super-2 number, since 2×21622006² = 935022286928072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79651 + ... + 79921.

It is an arithmetic number, because the mean of its divisors is an integer number (1199520).

Almost surely, 2^21622006 is an apocalyptic number.

21622006 is a deficient number, since it is larger than the sum of its proper divisors (16762634).

21622006 is a wasteful number, since it uses less digits than its factorization.

21622006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460.

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

The square root of 21622006 is about 4649.9468814170. The cubic root of 21622006 is about 278.5898745871.

Adding to 21622006 its reverse (60022612), we get a palindrome (81644618).

It can be divided in two parts, 216 and 22006, that added together give a palindrome (22222).

The spelling of 21622006 in words is "twenty-one million, six hundred twenty-two thousand, six".