21201027567 has 8 divisors (see below), whose sum is σ = 28284681600. Its totient is φ = 14125695960.

The previous prime is 21201027563. The next prime is 21201027581. The reversal of 21201027567 is 76572010212.

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

It is not a de Polignac number, because 21201027567 - 2² = 21201027563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201027563) 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, 2074659 + ... + 2084852.

It is an arithmetic number, because the mean of its divisors is an integer number (3535585200).

Almost surely, 2^21201027567 is an apocalyptic number.

21201027567 is a deficient number, since it is larger than the sum of its proper divisors (7083654033).

21201027567 is a wasteful number, since it uses less digits than its factorization.

21201027567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161213.

The product of its (nonzero) digits is 11760, while the sum is 33.

Adding to 21201027567 its reverse (76572010212), we get a palindrome (97773037779).

The spelling of 21201027567 in words is "twenty-one billion, two hundred one million, twenty-seven thousand, five hundred sixty-seven".