21433423311 has 16 divisors (see below), whose sum is σ = 31841683200. Its totient is φ = 14249140344.

The previous prime is 21433423279. The next prime is 21433423313. The reversal of 21433423311 is 11332433412.

It is a happy number.

21433423311 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 342 + 3 + 311 = 666.

It is not a de Polignac number, because 21433423311 - 2⁵ = 21433423279 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433423313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095921 + ... + 1115306.

It is an arithmetic number, because the mean of its divisors is an integer number (1990105200).

Almost surely, 2^21433423311 is an apocalyptic number.

21433423311 is a deficient number, since it is larger than the sum of its proper divisors (10408259889).

21433423311 is a wasteful number, since it uses less digits than its factorization.

21433423311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211595 (or 2211589 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21433423311 its reverse (11332433412), we get a palindrome (32765856723).

The spelling of 21433423311 in words is "twenty-one billion, four hundred thirty-three million, four hundred twenty-three thousand, three hundred eleven".