20111102020221 has 4 divisors (see below), whose sum is σ = 26814802693632. Its totient is φ = 13407401346812.

The previous prime is 20111102020123. The next prime is 20111102020223. The reversal of 20111102020221 is 12202020111102.

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 not a de Polignac number, because 20111102020221 - 2⁹ = 20111102019709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111102020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111102020223) 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, 3351850336701 + ... + 3351850336706.

It is an arithmetic number, because the mean of its divisors is an integer number (6703700673408).

Almost surely, 2^{20111102020221} is an apocalyptic number.

It is an amenable number.

20111102020221 is a deficient number, since it is larger than the sum of its proper divisors (6703700673411).

20111102020221 is an equidigital number, since it uses as much as digits as its factorization.

20111102020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703700673410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20111102020221 its reverse (12202020111102), we get a palindrome (32313122131323).

The spelling of 20111102020221 in words is "twenty trillion, one hundred eleven billion, one hundred two million, twenty thousand, two hundred twenty-one".