21004220504 has 32 divisors (see below), whose sum is σ = 39947790000. Its totient is φ = 10351660032.

The previous prime is 21004220411. The next prime is 21004220519. The reversal of 21004220504 is 40502240012.

It is a happy number.

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, 981632 + ... + 1002800.

Almost surely, 2^21004220504 is an apocalyptic number.

It is an amenable number.

21004220504 is a deficient number, since it is larger than the sum of its proper divisors (18943569496).

21004220504 is a wasteful number, since it uses less digits than its factorization.

21004220504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22947 (or 22943 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21004220504 its reverse (40502240012), we get a palindrome (61506460516).

The spelling of 21004220504 in words is "twenty-one billion, four million, two hundred twenty thousand, five hundred four".