21403312042 has 8 divisors (see below), whose sum is σ = 36691392096. Its totient is φ = 9172848012.

The previous prime is 21403312013. The next prime is 21403312057. The reversal of 21403312042 is 24021330412.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764403988 + ... + 764404015.

It is an arithmetic number, because the mean of its divisors is an integer number (4586424012).

Almost surely, 2^21403312042 is an apocalyptic number.

21403312042 is a deficient number, since it is larger than the sum of its proper divisors (15288080054).

21403312042 is a wasteful number, since it uses less digits than its factorization.

21403312042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528808012.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21403312042 its reverse (24021330412), we get a palindrome (45424642454).

The spelling of 21403312042 in words is "twenty-one billion, four hundred three million, three hundred twelve thousand, forty-two".