21311022311 has 8 divisors (see below), whose sum is σ = 21337849680. Its totient is φ = 21284214912.

The previous prime is 21311022277. The next prime is 21311022319. The reversal of 21311022311 is 11322011312.

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 21311022311 - 2⁶ = 21311022247 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 21311022311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311022319) 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, 3418145 + ... + 3424373.

It is an arithmetic number, because the mean of its divisors is an integer number (2667231210).

Almost surely, 2^21311022311 is an apocalyptic number.

21311022311 is a deficient number, since it is larger than the sum of its proper divisors (26827369).

21311022311 is a wasteful number, since it uses less digits than its factorization.

21311022311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311022311 its reverse (11322011312), we get a palindrome (32633033623).

The spelling of 21311022311 in words is "twenty-one billion, three hundred eleven million, twenty-two thousand, three hundred eleven".