21220122221011 has 4 divisors (see below), whose sum is σ = 24251568252592. Its totient is φ = 18188676189432.

The previous prime is 21220122220967. The next prime is 21220122221033. The reversal of 21220122221011 is 11012222102212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21220122221011 - 2⁷ = 21220122220883 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 21220122221011.

It is not an unprimeable number, because it can be changed into a prime (21220122221071) 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, 1515723015780 + ... + 1515723015793.

It is an arithmetic number, because the mean of its divisors is an integer number (6062892063148).

Almost surely, 2^{21220122221011} is an apocalyptic number.

21220122221011 is a deficient number, since it is larger than the sum of its proper divisors (3031446031581).

21220122221011 is an equidigital number, since it uses as much as digits as its factorization.

21220122221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031446031580.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21220122221011 its reverse (11012222102212), we get a palindrome (32232344323223).

The spelling of 21220122221011 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twenty-one thousand, eleven".