21331133442 has 24 divisors (see below), whose sum is σ = 46907271216. Its totient is φ = 7004252376.

The previous prime is 21331133423. The next prime is 21331133471. The reversal of 21331133442 is 24433113312.

It is a happy number.

21331133442 is a `hidden beast` number, since 2 + 1 + 3 + 311 + 3 + 344 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8842548 + ... + 8844959.

It is an arithmetic number, because the mean of its divisors is an integer number (1954469634).

Almost surely, 2^21331133442 is an apocalyptic number.

21331133442 is an abundant number, since it is smaller than the sum of its proper divisors (25576137774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21331133442 is a wasteful number, since it uses less digits than its factorization.

21331133442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17687582 (or 17687579 counting only the distinct ones).

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

Adding to 21331133442 its reverse (24433113312), we get a palindrome (45764246754).

It can be divided in two parts, 213311 and 33442, that added together give a triangular number (246753 = T₇₀₂).

The spelling of 21331133442 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty-three thousand, four hundred forty-two".