21013221011111 has 8 divisors (see below), whose sum is σ = 25427763240480. Its totient is φ = 16951842160128.

The previous prime is 21013221011063. The next prime is 21013221011137. The reversal of 21013221011111 is 11111012231012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013221011111 - 2²² = 21013216816807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21013221011111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013221011311) 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 7 ways as a sum of consecutive naturals, for example, 88290844466 + ... + 88290844703.

It is an arithmetic number, because the mean of its divisors is an integer number (3178470405060).

Almost surely, 2^{21013221011111} is an apocalyptic number.

21013221011111 is a deficient number, since it is larger than the sum of its proper divisors (4414542229369).

21013221011111 is a wasteful number, since it uses less digits than its factorization.

21013221011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176581689193.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21013221011111 its reverse (11111012231012), we get a palindrome (32124233242123).

The spelling of 21013221011111 in words is "twenty-one trillion, thirteen billion, two hundred twenty-one million, eleven thousand, one hundred eleven".