21571161067 has 8 divisors (see below), whose sum is σ = 21995284320. Its totient is φ = 21147672000.

The previous prime is 21571161049. The next prime is 21571161151. The reversal of 21571161067 is 76016117512.

It is a happy number.

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 21571161067 - 2⁷ = 21571160939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21571161037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89559 + ... + 226192.

It is an arithmetic number, because the mean of its divisors is an integer number (2749410540).

Almost surely, 2^21571161067 is an apocalyptic number.

21571161067 is a deficient number, since it is larger than the sum of its proper divisors (424123253).

21571161067 is a wasteful number, since it uses less digits than its factorization.

21571161067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317093.

The product of its (nonzero) digits is 17640, while the sum is 37.

Adding to 21571161067 its reverse (76016117512), we get a palindrome (97587278579).

The spelling of 21571161067 in words is "twenty-one billion, five hundred seventy-one million, one hundred sixty-one thousand, sixty-seven".