21116535212333 has 4 divisors (see below), whose sum is σ = 23036220231648. Its totient is φ = 19196850193020.

The previous prime is 21116535212291. The next prime is 21116535212341. The reversal of 21116535212333 is 33321253561112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21116535212333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116535215333) 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, 959842509641 + ... + 959842509662.

It is an arithmetic number, because the mean of its divisors is an integer number (5759055057912).

Almost surely, 2^{21116535212333} is an apocalyptic number.

It is an amenable number.

21116535212333 is a deficient number, since it is larger than the sum of its proper divisors (1919685019315).

21116535212333 is a wasteful number, since it uses less digits than its factorization.

21116535212333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919685019314.

The product of its digits is 97200, while the sum is 38.

Adding to 21116535212333 its reverse (33321253561112), we get a palindrome (54437788773445).

The spelling of 21116535212333 in words is "twenty-one trillion, one hundred sixteen billion, five hundred thirty-five million, two hundred twelve thousand, three hundred thirty-three".