21004134104 has 32 divisors (see below), whose sum is σ = 39474743040. Its totient is φ = 10477572000.

The previous prime is 21004134097. The next prime is 21004134121. The reversal of 21004134104 is 40143140012.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8667437 + ... + 8669859.

It is an arithmetic number, because the mean of its divisors is an integer number (1233585720).

Almost surely, 2^21004134104 is an apocalyptic number.

It is an amenable number.

21004134104 is a deficient number, since it is larger than the sum of its proper divisors (18470608936).

21004134104 is a wasteful number, since it uses less digits than its factorization.

21004134104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21004134104 its reverse (40143140012), we get a palindrome (61147274116).

The spelling of 21004134104 in words is "twenty-one billion, four million, one hundred thirty-four thousand, one hundred four".