20111102222021 has 4 divisors (see below), whose sum is σ = 20440792422444. Its totient is φ = 19781412021600.

The previous prime is 20111102222017. The next prime is 20111102222053. The reversal of 20111102222021 is 12022220111102.

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 328942396225 + 19782159825796 = 573535^2 + 4447714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111102222021 - 2² = 20111102222017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111102282021) 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, 164845100120 + ... + 164845100241.

It is an arithmetic number, because the mean of its divisors is an integer number (5110198105611).

Almost surely, 2^{20111102222021} is an apocalyptic number.

It is an amenable number.

20111102222021 is a deficient number, since it is larger than the sum of its proper divisors (329690200423).

20111102222021 is an equidigital number, since it uses as much as digits as its factorization.

20111102222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329690200422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20111102222021 its reverse (12022220111102), we get a palindrome (32133322333123).

The spelling of 20111102222021 in words is "twenty trillion, one hundred eleven billion, one hundred two million, two hundred twenty-two thousand, twenty-one".