21222202020221 has 8 divisors (see below), whose sum is σ = 21241044319488. Its totient is φ = 21203363610000.

The previous prime is 21222202020139. The next prime is 21222202020289. The reversal of 21222202020221 is 12202020222212.

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 21222202020221 - 2²⁶ = 21222134911357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21222202020193 and 21222202020202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222202050221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10001336 + ... + 11936126.

It is an arithmetic number, because the mean of its divisors is an integer number (2655130539936).

Almost surely, 2^{21222202020221} is an apocalyptic number.

It is an amenable number.

21222202020221 is a deficient number, since it is larger than the sum of its proper divisors (18842299267).

21222202020221 is a wasteful number, since it uses less digits than its factorization.

21222202020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944523.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21222202020221 its reverse (12202020222212), we get a palindrome (33424222242433).

The spelling of 21222202020221 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred two million, twenty thousand, two hundred twenty-one".