21248571604 has 48 divisors (see below), whose sum is σ = 41976285120. Its totient is φ = 9345288960.

The previous prime is 21248571599. The next prime is 21248571607. The reversal of 21248571604 is 40617584212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248571607) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 24214 + ... + 207565.

It is an arithmetic number, because the mean of its divisors is an integer number (874505940).

Almost surely, 2^21248571604 is an apocalyptic number.

It is an amenable number.

21248571604 is a deficient number, since it is larger than the sum of its proper divisors (20727713516).

21248571604 is a wasteful number, since it uses less digits than its factorization.

21248571604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231880 (or 231878 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

It can be divided in two parts, 212485 and 71604, that added together give a square (284089 = 533²).

The spelling of 21248571604 in words is "twenty-one billion, two hundred forty-eight million, five hundred seventy-one thousand, six hundred four".