20111102022221 has 4 divisors (see below), whose sum is σ = 22984116596832. Its totient is φ = 17238087447612.

The previous prime is 20111102022133. The next prime is 20111102022239. The reversal of 20111102022221 is 12222020111102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111102022221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111102022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111102042221) 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, 1436507287295 + ... + 1436507287308.

It is an arithmetic number, because the mean of its divisors is an integer number (5746029149208).

Almost surely, 2^{20111102022221} is an apocalyptic number.

It is an amenable number.

20111102022221 is a deficient number, since it is larger than the sum of its proper divisors (2873014574611).

20111102022221 is an equidigital number, since it uses as much as digits as its factorization.

20111102022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873014574610.

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

Adding to 20111102022221 its reverse (12222020111102), we get a palindrome (32333122133323).

The spelling of 20111102022221 in words is "twenty trillion, one hundred eleven billion, one hundred two million, twenty-two thousand, two hundred twenty-one".