21236606504 has 16 divisors (see below), whose sum is σ = 41191694100. Its totient is φ = 10252154752.

The previous prime is 21236606483. The next prime is 21236606519. The reversal of 21236606504 is 40560663212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18659013604 + 2577592900 = 136598^2 + 50770^2 .

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, 45768317 + ... + 45768780.

Almost surely, 2^21236606504 is an apocalyptic number.

It is an amenable number.

21236606504 is a deficient number, since it is larger than the sum of its proper divisors (19955087596).

21236606504 is a wasteful number, since it uses less digits than its factorization.

21236606504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91537132 (or 91537128 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21236606504 in words is "twenty-one billion, two hundred thirty-six million, six hundred six thousand, five hundred four".