21605362352 has 20 divisors (see below), whose sum is σ = 47840445456. Its totient is φ = 9259440960.

The previous prime is 21605362351. The next prime is 21605362357. The reversal of 21605362352 is 25326350612.

It is a super-2 number, since 2×21605362352² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21605362351) 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 3 ways as a sum of consecutive naturals, for example, 96452399 + ... + 96452622.

Almost surely, 2^21605362352 is an apocalyptic number.

It is an amenable number.

21605362352 is an abundant number, since it is smaller than the sum of its proper divisors (26235083104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21605362352 is a wasteful number, since it uses less digits than its factorization.

21605362352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192905036 (or 192905030 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 21605362352 in words is "twenty-one billion, six hundred five million, three hundred sixty-two thousand, three hundred fifty-two".