21021111333333 has 12 divisors (see below), whose sum is σ = 30467458295820. Its totient is φ = 13966244615616.

The previous prime is 21021111333269. The next prime is 21021111333347. The reversal of 21021111333333 is 33333311112012.

21021111333333 is a `hidden beast` number, since 2 + 1 + 0 + 211 + 113 + 3 + 3 + 333 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20561309353764 + 459801979569 = 4534458^2 + 678087^2 .

It is not a de Polignac number, because 21021111333333 - 2⁶ = 21021111333269 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21021111333297 and 21021111333306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021111333373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3985797768 + ... + 3985803041.

It is an arithmetic number, because the mean of its divisors is an integer number (2538954857985).

Almost surely, 2^{21021111333333} is an apocalyptic number.

It is an amenable number.

21021111333333 is a deficient number, since it is larger than the sum of its proper divisors (9446346962487).

21021111333333 is a wasteful number, since it uses less digits than its factorization.

21021111333333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7971601108 (or 7971601105 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

Adding to 21021111333333 its reverse (33333311112012), we get a palindrome (54354422445345).

The spelling of 21021111333333 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, three hundred thirty-three thousand, three hundred thirty-three".