21868263515127 has 4 divisors (see below), whose sum is σ = 29157684686840. Its totient is φ = 14578842343416.

The previous prime is 21868263515069. The next prime is 21868263515177. The reversal of 21868263515127 is 72151536286812.

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

It is not a de Polignac number, because 21868263515127 - 2³⁵ = 21833903776759 is a prime.

It is a super-2 number, since 2×21868263515127² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868263515177) 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, 3644710585852 + ... + 3644710585857.

It is an arithmetic number, because the mean of its divisors is an integer number (7289421171710).

Almost surely, 2^{21868263515127} is an apocalyptic number.

21868263515127 is a deficient number, since it is larger than the sum of its proper divisors (7289421171713).

21868263515127 is an equidigital number, since it uses as much as digits as its factorization.

21868263515127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7289421171712.

The product of its digits is 9676800, while the sum is 57.

The spelling of 21868263515127 in words is "twenty-one trillion, eight hundred sixty-eight billion, two hundred sixty-three million, five hundred fifteen thousand, one hundred twenty-seven".