21222200021 has 8 divisors (see below), whose sum is σ = 23304813888. Its totient is φ = 19165140000.

The previous prime is 21222200011. The next prime is 21222200023. The reversal of 21222200021 is 12000222212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222200021 - 2¹⁴ = 21222183637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222199969 and 21222200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222200023) 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 7 ways as a sum of consecutive naturals, for example, 6386720 + ... + 6390041.

It is an arithmetic number, because the mean of its divisors is an integer number (2913101736).

Almost surely, 2^21222200021 is an apocalyptic number.

It is an amenable number.

21222200021 is a deficient number, since it is larger than the sum of its proper divisors (2082613867).

21222200021 is a wasteful number, since it uses less digits than its factorization.

21222200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12776923.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21222200021 its reverse (12000222212), we get a palindrome (33222422233).

The spelling of 21222200021 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, twenty-one".