21310321111 has 16 divisors (see below), whose sum is σ = 22361882400. Its totient is φ = 20280250368.

The previous prime is 21310321027. The next prime is 21310321133. The reversal of 21310321111 is 11112301312.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310321111 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 (21310321141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4966455 + ... + 4970743.

It is an arithmetic number, because the mean of its divisors is an integer number (1397617650).

Almost surely, 2^21310321111 is an apocalyptic number.

21310321111 is a deficient number, since it is larger than the sum of its proper divisors (1051561289).

21310321111 is a wasteful number, since it uses less digits than its factorization.

21310321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738.

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

Adding to 21310321111 its reverse (11112301312), we get a palindrome (32422622423).

The spelling of 21310321111 in words is "twenty-one billion, three hundred ten million, three hundred twenty-one thousand, one hundred eleven".