21174813652 has 24 divisors (see below), whose sum is σ = 38873640960. Its totient is φ = 10078343520.

The previous prime is 21174813601. The next prime is 21174813677. The reversal of 21174813652 is 25631847112.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1277268 + ... + 1293739.

It is an arithmetic number, because the mean of its divisors is an integer number (1619735040).

Almost surely, 2^21174813652 is an apocalyptic number.

It is an amenable number.

21174813652 is a deficient number, since it is larger than the sum of its proper divisors (17698827308).

21174813652 is a wasteful number, since it uses less digits than its factorization.

21174813652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571111 (or 2571109 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The spelling of 21174813652 in words is "twenty-one billion, one hundred seventy-four million, eight hundred thirteen thousand, six hundred fifty-two".