21047328161 has 8 divisors (see below), whose sum is σ = 21418610304. Its totient is φ = 20678848560.

The previous prime is 21047328131. The next prime is 21047328163. The reversal of 21047328161 is 16182374012.

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

It is a cyclic number.

It is not a de Polignac number, because 21047328161 - 2⁶ = 21047328097 is a prime.

It is a super-3 number, since 3×21047328161³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21047328163) 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 7 ways as a sum of consecutive naturals, for example, 685481 + ... + 715526.

It is an arithmetic number, because the mean of its divisors is an integer number (2677326288).

Almost surely, 2^21047328161 is an apocalyptic number.

It is an amenable number.

21047328161 is a deficient number, since it is larger than the sum of its proper divisors (371282143).

21047328161 is a wasteful number, since it uses less digits than its factorization.

21047328161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401271.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 21047328161 in words is "twenty-one billion, forty-seven million, three hundred twenty-eight thousand, one hundred sixty-one".