21233311311 has 8 divisors (see below), whose sum is σ = 28315692720. Its totient is φ = 14153235392.

The previous prime is 21233311303. The next prime is 21233311361. The reversal of 21233311311 is 11311333212.

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 21233311311 - 2³ = 21233311303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233311361) 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, 554766 + ... + 591803.

It is an arithmetic number, because the mean of its divisors is an integer number (3539461590).

Almost surely, 2^21233311311 is an apocalyptic number.

21233311311 is a deficient number, since it is larger than the sum of its proper divisors (7082381409).

21233311311 is a wasteful number, since it uses less digits than its factorization.

21233311311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152745.

The product of its digits is 324, while the sum is 21.

Adding to 21233311311 its reverse (11311333212), we get a palindrome (32544644523).

The spelling of 21233311311 in words is "twenty-one billion, two hundred thirty-three million, three hundred eleven thousand, three hundred eleven".