21022120220111 has 4 divisors (see below), whose sum is σ = 21022130843952. Its totient is φ = 21022109596272.

The previous prime is 21022120220089. The next prime is 21022120220117. The reversal of 21022120220111 is 11102202122012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21022120220111 - 2³⁰ = 21021046478287 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 21022120220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022120220117) 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, 1367390 + ... + 6626763.

It is an arithmetic number, because the mean of its divisors is an integer number (5255532710988).

Almost surely, 2^{21022120220111} is an apocalyptic number.

21022120220111 is a deficient number, since it is larger than the sum of its proper divisors (10623841).

21022120220111 is an equidigital number, since it uses as much as digits as its factorization.

21022120220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10623840.

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

Adding to 21022120220111 its reverse (11102202122012), we get a palindrome (32124322342123).

The spelling of 21022120220111 in words is "twenty-one trillion, twenty-two billion, one hundred twenty million, two hundred twenty thousand, one hundred eleven".