21222001202221 has 8 divisors (see below), whose sum is σ = 21234448475424. Its totient is φ = 21209556579120.

The previous prime is 21222001202209. The next prime is 21222001202251. The reversal of 21222001202221 is 12220210022212.

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 21222001202221 - 2¹¹ = 21222001200173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222001202201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15473206 + ... + 16788808.

It is an arithmetic number, because the mean of its divisors is an integer number (2654306059428).

Almost surely, 2^{21222001202221} is an apocalyptic number.

It is an amenable number.

21222001202221 is a deficient number, since it is larger than the sum of its proper divisors (12447273203).

21222001202221 is a wasteful number, since it uses less digits than its factorization.

21222001202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325051.

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

Adding to 21222001202221 its reverse (12220210022212), we get a palindrome (33442211224433).

The spelling of 21222001202221 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred two thousand, two hundred twenty-one".