22021102221 has 16 divisors (see below), whose sum is σ = 30641504640. Its totient is φ = 14040861120.

The previous prime is 22021102211. The next prime is 22021102223. The reversal of 22021102221 is 12220112022.

It is not a de Polignac number, because 22021102221 - 2¹¹ = 22021100173 is a prime.

It is a super-2 number, since 2×22021102221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22021102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021102223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098831 + ... + 1118691.

It is an arithmetic number, because the mean of its divisors is an integer number (1915094040).

Almost surely, 2^22021102221 is an apocalyptic number.

It is an amenable number.

22021102221 is a deficient number, since it is larger than the sum of its proper divisors (8620402419).

22021102221 is a wasteful number, since it uses less digits than its factorization.

22021102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35956.

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

Adding to 22021102221 its reverse (12220112022), we get a palindrome (34241214243).

The spelling of 22021102221 in words is "twenty-two billion, twenty-one million, one hundred two thousand, two hundred twenty-one".