21132044242 has 8 divisors (see below), whose sum is σ = 33562658556. Its totient is φ = 9944491392.

The previous prime is 21132044237. The next prime is 21132044243. The reversal of 21132044242 is 24244023112.

It can be written as a sum of positive squares in 2 ways, for example, as 17705229721 + 3426814521 = 133061^2 + 58539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21132044243) 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 3 ways as a sum of consecutive naturals, for example, 310765323 + ... + 310765390.

Almost surely, 2^21132044242 is an apocalyptic number.

21132044242 is a deficient number, since it is larger than the sum of its proper divisors (12430614314).

21132044242 is a wasteful number, since it uses less digits than its factorization.

21132044242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621530732.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21132044242 its reverse (24244023112), we get a palindrome (45376067354).

The spelling of 21132044242 in words is "twenty-one billion, one hundred thirty-two million, forty-four thousand, two hundred forty-two".