21865062163 has 4 divisors (see below), whose sum is σ = 24988642480. Its totient is φ = 18741481848.

The previous prime is 21865062161. The next prime is 21865062211. The reversal of 21865062163 is 36126056812.

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 21865062163 - 2¹ = 21865062161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21865062161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561790148 + ... + 1561790161.

It is an arithmetic number, because the mean of its divisors is an integer number (6247160620).

Almost surely, 2^21865062163 is an apocalyptic number.

21865062163 is a deficient number, since it is larger than the sum of its proper divisors (3123580317).

21865062163 is an equidigital number, since it uses as much as digits as its factorization.

21865062163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123580316.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21865062163 in words is "twenty-one billion, eight hundred sixty-five million, sixty-two thousand, one hundred sixty-three".