21550431020530 has 8 divisors (see below), whose sum is σ = 38790775836972. Its totient is φ = 8620172408208.

The previous prime is 21550431020519. The next prime is 21550431020593. The reversal of 21550431020530 is 3502013405512.

It can be written as a sum of positive squares in 2 ways, for example, as 21550420071049 + 10949481 = 4642243^2 + 3309^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21550431020492 and 21550431020501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077521551017 + ... + 1077521551036.

Almost surely, 2^{21550431020530} is an apocalyptic number.

21550431020530 is a deficient number, since it is larger than the sum of its proper divisors (17240344816442).

21550431020530 is a wasteful number, since it uses less digits than its factorization.

21550431020530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155043102060.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21550431020530 in words is "twenty-one trillion, five hundred fifty billion, four hundred thirty-one million, twenty thousand, five hundred thirty".