21040130442 has 8 divisors (see below), whose sum is σ = 42080260896. Its totient is φ = 7013376812.

The previous prime is 21040130413. The next prime is 21040130459. The reversal of 21040130442 is 24403104012.

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

21040130442 is an admirable number.

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, 1753344198 + ... + 1753344209.

It is an arithmetic number, because the mean of its divisors is an integer number (5260032612).

Almost surely, 2^21040130442 is an apocalyptic number.

21040130442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21040130442 is a wasteful number, since it uses less digits than its factorization.

21040130442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506688412.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21040130442 its reverse (24403104012), we get a palindrome (45443234454).

The spelling of 21040130442 in words is "twenty-one billion, forty million, one hundred thirty thousand, four hundred forty-two".