21100003042 has 8 divisors (see below), whose sum is σ = 31651563996. Its totient is φ = 10549481712.

The previous prime is 21100003039. The next prime is 21100003079. The reversal of 21100003042 is 24030000112.

It can be written as a sum of positive squares in 2 ways, for example, as 20998618281 + 101384761 = 144909^2 + 10069^2 .

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207013 + ... + 291640.

Almost surely, 2^21100003042 is an apocalyptic number.

21100003042 is a deficient number, since it is larger than the sum of its proper divisors (10551560954).

21100003042 is a wasteful number, since it uses less digits than its factorization.

21100003042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519812.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21100003042 its reverse (24030000112), we get a palindrome (45130003154).

The spelling of 21100003042 in words is "twenty-one billion, one hundred million, three thousand, forty-two".