21002331311 has 8 divisors (see below), whose sum is σ = 23099127744. Its totient is φ = 18974282400.

The previous prime is 21002331239. The next prime is 21002331347. The reversal of 21002331311 is 11313320012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002331311 - 2¹⁰ = 21002330287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002331311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002331011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17186240 + ... + 17187461.

It is an arithmetic number, because the mean of its divisors is an integer number (2887390968).

Almost surely, 2^21002331311 is an apocalyptic number.

21002331311 is a deficient number, since it is larger than the sum of its proper divisors (2096796433).

21002331311 is a wasteful number, since it uses less digits than its factorization.

21002331311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34373761.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21002331311 its reverse (11313320012), we get a palindrome (32315651323).

The spelling of 21002331311 in words is "twenty-one billion, two million, three hundred thirty-one thousand, three hundred eleven".