21231311101 has 96 divisors (see below), whose sum is σ = 30740338944. Its totient is φ = 14217984000.

The previous prime is 21231311071. The next prime is 21231311159. The reversal of 21231311101 is 10111313212.

It is a happy number.

It is not a de Polignac number, because 21231311101 - 2⁵ = 21231311069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231311161) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18905326 + ... + 18906448.

It is an arithmetic number, because the mean of its divisors is an integer number (320211864).

Almost surely, 2^21231311101 is an apocalyptic number.

It is an amenable number.

21231311101 is a deficient number, since it is larger than the sum of its proper divisors (9509027843).

21231311101 is a wasteful number, since it uses less digits than its factorization.

21231311101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21231311101 its reverse (10111313212), we get a palindrome (31342624313).

It can be divided in two parts, 212 and 31311101, that added together give a palindrome (31311313).

The spelling of 21231311101 in words is "twenty-one billion, two hundred thirty-one million, three hundred eleven thousand, one hundred one".