21120222202221 has 8 divisors (see below), whose sum is σ = 28160351493120. Its totient is φ = 14080120523072.

The previous prime is 21120222202171. The next prime is 21120222202223. The reversal of 21120222202221 is 12220222202112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120222202221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222202223) 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, 5046876 + ... + 8228693.

It is an arithmetic number, because the mean of its divisors is an integer number (3520043936640).

Almost surely, 2^{21120222202221} is an apocalyptic number.

It is an amenable number.

21120222202221 is a deficient number, since it is larger than the sum of its proper divisors (7040129290899).

21120222202221 is a wasteful number, since it uses less digits than its factorization.

21120222202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13805875.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21120222202221 its reverse (12220222202112), we get a palindrome (33340444404333).

The spelling of 21120222202221 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, two hundred two thousand, two hundred twenty-one".