21102111113311 has 4 divisors (see below), whose sum is σ = 21592857883432. Its totient is φ = 20611364343192.

The previous prime is 21102111113273. The next prime is 21102111113339. The reversal of 21102111113311 is 11331111120112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102111113311 is a prime.

It is a super-2 number, since 2×21102111113311² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102111113341) 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 3 ways as a sum of consecutive naturals, for example, 245373384996 + ... + 245373385081.

It is an arithmetic number, because the mean of its divisors is an integer number (5398214470858).

Almost surely, 2^{21102111113311} is an apocalyptic number.

21102111113311 is a deficient number, since it is larger than the sum of its proper divisors (490746770121).

21102111113311 is an equidigital number, since it uses as much as digits as its factorization.

21102111113311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490746770120.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 21102111113311 its reverse (11331111120112), we get a palindrome (32433222233423).

The spelling of 21102111113311 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred thirteen thousand, three hundred eleven".