21311013211 has 8 divisors (see below), whose sum is σ = 21779127360. Its totient is φ = 20843511168.

The previous prime is 21311013203. The next prime is 21311013233. The reversal of 21311013211 is 11231011312.

It is a happy number.

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 21311013211 - 2³ = 21311013203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311013011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82276 + ... + 222241.

It is an arithmetic number, because the mean of its divisors is an integer number (2722390920).

Almost surely, 2^21311013211 is an apocalyptic number.

21311013211 is a deficient number, since it is larger than the sum of its proper divisors (468114149).

21311013211 is a wasteful number, since it uses less digits than its factorization.

21311013211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306053.

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

Adding to 21311013211 its reverse (11231011312), we get a palindrome (32542024523).

It can be divided in two parts, 2131101 and 3211, that added together give a palindrome (2134312).

The spelling of 21311013211 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, two hundred eleven".