21604050352 has 10 divisors (see below), whose sum is σ = 41857847588. Its totient is φ = 10802025168.

The previous prime is 21604050343. The next prime is 21604050359. The reversal of 21604050352 is 25305040612.

It is a super-2 number, since 2×21604050352² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21604050352.

It is not an unprimeable number, because it can be changed into a prime (21604050359) 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 as a sum of consecutive naturals, namely, 675126558 + ... + 675126589.

Almost surely, 2^21604050352 is an apocalyptic number.

It is an amenable number.

21604050352 is a deficient number, since it is larger than the sum of its proper divisors (20253797236).

21604050352 is a wasteful number, since it uses less digits than its factorization.

21604050352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350253155 (or 1350253149 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21604050352 its reverse (25305040612), we get a palindrome (46909090964).

The spelling of 21604050352 in words is "twenty-one billion, six hundred four million, fifty thousand, three hundred fifty-two".