21133223311 has 16 divisors (see below), whose sum is σ = 23661566208. Its totient is φ = 18778982400.

The previous prime is 21133223269. The next prime is 21133223323. The reversal of 21133223311 is 11332233112.

It is a cyclic number.

It is not a de Polignac number, because 21133223311 - 2⁷ = 21133223183 is a prime.

It is a super-2 number, since 2×21133223311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133223381) 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, 467430 + ... + 510643.

It is an arithmetic number, because the mean of its divisors is an integer number (1478847888).

Almost surely, 2^21133223311 is an apocalyptic number.

21133223311 is a deficient number, since it is larger than the sum of its proper divisors (2528342897).

21133223311 is a wasteful number, since it uses less digits than its factorization.

21133223311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978162.

The product of its digits is 648, while the sum is 22.

Adding to 21133223311 its reverse (11332233112), we get a palindrome (32465456423).

It can be divided in two parts, 2 and 1133223311, that multiplied together give a palindrome (2266446622).

The spelling of 21133223311 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-three thousand, three hundred eleven".