21220102221 has 8 divisors (see below), whose sum is σ = 28295107104. Its totient is φ = 14145916080.

The previous prime is 21220102171. The next prime is 21220102223. The reversal of 21220102221 is 12220102212.

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

It is not a de Polignac number, because 21220102221 - 2⁷ = 21220102093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220102223) 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, 141415 + ... + 249876.

It is an arithmetic number, because the mean of its divisors is an integer number (3536888388).

Almost surely, 2^21220102221 is an apocalyptic number.

It is an amenable number.

21220102221 is a deficient number, since it is larger than the sum of its proper divisors (7075004883).

21220102221 is a wasteful number, since it uses less digits than its factorization.

21220102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409371.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220102221 its reverse (12220102212), we get a palindrome (33440204433).

Subtracting from 21220102221 its reverse (12220102212), we obtain a palindrome (9000000009).

The spelling of 21220102221 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred twenty-one".