21022222005 has 40 divisors (see below), whose sum is σ = 37697311872. Its totient is φ = 11207974752.

The previous prime is 21022221923. The next prime is 21022222007. The reversal of 21022222005 is 50022222012.

It is not a de Polignac number, because 21022222005 - 2⁷ = 21022221877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022222007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1460152 + ... + 1474478.

Almost surely, 2^21022222005 is an apocalyptic number.

It is an amenable number.

21022222005 is a deficient number, since it is larger than the sum of its proper divisors (16675089867).

21022222005 is a wasteful number, since it uses less digits than its factorization.

21022222005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17967 (or 17958 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 21022222005 its reverse (50022222012), we get a palindrome (71044444017).

The spelling of 21022222005 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, five".