21115002115567 has 4 divisors (see below), whose sum is σ = 21564257479776. Its totient is φ = 20665746751360.

The previous prime is 21115002115547. The next prime is 21115002115607. The reversal of 21115002115567 is 76551120051112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21115002115567 - 2³⁵ = 21080642377199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115002115547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224627682034 + ... + 224627682127.

It is an arithmetic number, because the mean of its divisors is an integer number (5391064369944).

Almost surely, 2^{21115002115567} is an apocalyptic number.

21115002115567 is a deficient number, since it is larger than the sum of its proper divisors (449255364209).

21115002115567 is an equidigital number, since it uses as much as digits as its factorization.

21115002115567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449255364208.

The product of its (nonzero) digits is 21000, while the sum is 37.

Adding to 21115002115567 its reverse (76551120051112), we get a palindrome (97666122166679).

The spelling of 21115002115567 in words is "twenty-one trillion, one hundred fifteen billion, two million, one hundred fifteen thousand, five hundred sixty-seven".