21756071530 has 8 divisors (see below), whose sum is σ = 39160928772. Its totient is φ = 8702428608.

The previous prime is 21756071503. The next prime is 21756071563. The reversal of 21756071530 is 3517065712.

It can be written as a sum of positive squares in 2 ways, for example, as 20062172881 + 1693898649 = 141641^2 + 41157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21756071530.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087803567 + ... + 1087803586.

Almost surely, 2^21756071530 is an apocalyptic number.

21756071530 is a deficient number, since it is larger than the sum of its proper divisors (17404857242).

21756071530 is a wasteful number, since it uses less digits than its factorization.

21756071530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175607160.

The product of its (nonzero) digits is 44100, while the sum is 37.

The spelling of 21756071530 in words is "twenty-one billion, seven hundred fifty-six million, seventy-one thousand, five hundred thirty".