21220112202221 has 8 divisors (see below), whose sum is σ = 21713665077984. Its totient is φ = 20726562139920.

The previous prime is 21220112202077. The next prime is 21220112202287. The reversal of 21220112202221 is 12220221102212.

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-21220112202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220112202193 and 21220112202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220112202721) 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, 28384106 + ... + 29122116.

It is an arithmetic number, because the mean of its divisors is an integer number (2714208134748).

Almost surely, 2^{21220112202221} is an apocalyptic number.

It is an amenable number.

21220112202221 is a deficient number, since it is larger than the sum of its proper divisors (493552875763).

21220112202221 is an equidigital number, since it uses as much as digits as its factorization.

21220112202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406731.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21220112202221 its reverse (12220221102212), we get a palindrome (33440333304433).

The spelling of 21220112202221 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, two hundred two thousand, two hundred twenty-one".