21031211333 has 4 divisors (see below), whose sum is σ = 22943139648. Its totient is φ = 19119283020.

The previous prime is 21031211297. The next prime is 21031211371. The reversal of 21031211333 is 33311213012.

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 not a de Polignac number, because 21031211333 - 2¹⁶ = 21031145797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031211233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955964141 + ... + 955964162.

It is an arithmetic number, because the mean of its divisors is an integer number (5735784912).

Almost surely, 2^21031211333 is an apocalyptic number.

It is an amenable number.

21031211333 is a deficient number, since it is larger than the sum of its proper divisors (1911928315).

21031211333 is a wasteful number, since it uses less digits than its factorization.

21031211333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911928314.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21031211333 its reverse (33311213012), we get a palindrome (54342424345).

The spelling of 21031211333 in words is "twenty-one billion, thirty-one million, two hundred eleven thousand, three hundred thirty-three".