21111111111333 has 16 divisors (see below), whose sum is σ = 28296443359296. Its totient is φ = 14000097121920.

The previous prime is 21111111111317. The next prime is 21111111111359. The reversal of 21111111111333 is 33311111111112.

It is not a de Polignac number, because 21111111111333 - 2⁴ = 21111111111317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111111111313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20836366 + ... + 21826047.

It is an arithmetic number, because the mean of its divisors is an integer number (1768527709956).

Almost surely, 2^{21111111111333} is an apocalyptic number.

It is an amenable number.

21111111111333 is a deficient number, since it is larger than the sum of its proper divisors (7185332247963).

21111111111333 is a wasteful number, since it uses less digits than its factorization.

21111111111333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42663284.

The product of its digits is 54, while the sum is 21.

Adding to 21111111111333 its reverse (33311111111112), we get a palindrome (54422222222445).

The spelling of 21111111111333 in words is "twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, three hundred thirty-three".