21041245163 has 4 divisors (see below), whose sum is σ = 21041970048. Its totient is φ = 21040520280.

The previous prime is 21041245139. The next prime is 21041245171. The reversal of 21041245163 is 36154214012.

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 21041245163 - 2²⁶ = 20974136299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041245103) 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, 317003 + ... + 377588.

It is an arithmetic number, because the mean of its divisors is an integer number (5260492512).

Almost surely, 2^21041245163 is an apocalyptic number.

21041245163 is a deficient number, since it is larger than the sum of its proper divisors (724885).

21041245163 is an equidigital number, since it uses as much as digits as its factorization.

21041245163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724884.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21041245163 its reverse (36154214012), we get a palindrome (57195459175).

The spelling of 21041245163 in words is "twenty-one billion, forty-one million, two hundred forty-five thousand, one hundred sixty-three".