21572051167 has 2 divisors, whose sum is σ = 21572051168. Its totient is φ = 21572051166.

The previous prime is 21572051131. The next prime is 21572051209. The reversal of 21572051167 is 76115027512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21572051167 - 2¹¹ = 21572049119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21572052167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10786025583 + 10786025584.

It is an arithmetic number, because the mean of its divisors is an integer number (10786025584).

Almost surely, 2^21572051167 is an apocalyptic number.

21572051167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21572051167 is an equidigital number, since it uses as much as digits as its factorization.

21572051167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 37.

Adding to 21572051167 its reverse (76115027512), we get a palindrome (97687078679).

The spelling of 21572051167 in words is "twenty-one billion, five hundred seventy-two million, fifty-one thousand, one hundred sixty-seven".