22011002221 has 4 divisors (see below), whose sum is σ = 23704156252. Its totient is φ = 20317848192.

The previous prime is 22011002213. The next prime is 22011002269. The reversal of 22011002221 is 12220011022.

It is a happy number.

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 3067608996 + 18943393225 = 55386^2 + 137635^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011002221 - 2³ = 22011002213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1693154017 = 22011002221 / (2 + 2 + 0 + 1 + 1 + 0 + 0 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011002281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 846576996 + ... + 846577021.

It is an arithmetic number, because the mean of its divisors is an integer number (5926039063).

Almost surely, 2^22011002221 is an apocalyptic number.

It is an amenable number.

22011002221 is a deficient number, since it is larger than the sum of its proper divisors (1693154031).

22011002221 is a wasteful number, since it uses less digits than its factorization.

22011002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693154030.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22011002221 its reverse (12220011022), we get a palindrome (34231013243).

The spelling of 22011002221 in words is "twenty-two billion, eleven million, two thousand, two hundred twenty-one".