21002021122222 has 8 divisors (see below), whose sum is σ = 36003464780976. Its totient is φ = 9000866195232.

The previous prime is 21002021122217. The next prime is 21002021122253. The reversal of 21002021122222 is 22222112020012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21002021122222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750072182923 + ... + 750072182950.

It is an arithmetic number, because the mean of its divisors is an integer number (4500433097622).

Almost surely, 2^{21002021122222} is an apocalyptic number.

21002021122222 is a deficient number, since it is larger than the sum of its proper divisors (15001443658754).

21002021122222 is a wasteful number, since it uses less digits than its factorization.

21002021122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500144365882.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21002021122222 its reverse (22222112020012), we get a palindrome (43224133142234).

The spelling of 21002021122222 in words is "twenty-one trillion, two billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".