22102011221 has 4 divisors (see below), whose sum is σ = 22404778572. Its totient is φ = 21799243872.

The previous prime is 22102011209. The next prime is 22102011247. The reversal of 22102011221 is 12211020122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17627872900 + 4474138321 = 132770^2 + 66889^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102011221 - 2¹⁰ = 22102010197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102011196 and 22102011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102017221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151383566 + ... + 151383711.

It is an arithmetic number, because the mean of its divisors is an integer number (5601194643).

Almost surely, 2^22102011221 is an apocalyptic number.

It is an amenable number.

22102011221 is a deficient number, since it is larger than the sum of its proper divisors (302767351).

22102011221 is an equidigital number, since it uses as much as digits as its factorization.

22102011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302767350.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22102011221 its reverse (12211020122), we get a palindrome (34313031343).

The spelling of 22102011221 in words is "twenty-two billion, one hundred two million, eleven thousand, two hundred twenty-one".