21124240442 has 8 divisors (see below), whose sum is σ = 31691984832. Its totient is φ = 10560245500.

The previous prime is 21124240433. The next prime is 21124240469. The reversal of 21124240442 is 24404242112.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 923234 + ... + 945837.

It is an arithmetic number, because the mean of its divisors is an integer number (3961498104).

Almost surely, 2^21124240442 is an apocalyptic number.

21124240442 is a deficient number, since it is larger than the sum of its proper divisors (10567744390).

21124240442 is a wasteful number, since it uses less digits than its factorization.

21124240442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874724.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21124240442 its reverse (24404242112), we get a palindrome (45528482554).

The spelling of 21124240442 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty thousand, four hundred forty-two".