21142044104 has 16 divisors (see below), whose sum is σ = 39647270220. Its totient is φ = 10569438720.

The previous prime is 21142044083. The next prime is 21142044151. The reversal of 21142044104 is 40144024112.

It can be written as a sum of positive squares in 2 ways, for example, as 21141741604 + 302500 = 145402^2 + 550^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21142044104.

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, 140177 + ... + 248864.

Almost surely, 2^21142044104 is an apocalyptic number.

It is an amenable number.

21142044104 is a deficient number, since it is larger than the sum of its proper divisors (18505226116).

21142044104 is a wasteful number, since it uses less digits than its factorization.

21142044104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395840 (or 395836 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21142044104 its reverse (40144024112), we get a palindrome (61286068216).

The spelling of 21142044104 in words is "twenty-one billion, one hundred forty-two million, forty-four thousand, one hundred four".