21244364163 has 12 divisors (see below), whose sum is σ = 33475967928. Its totient is φ = 12875372160.

The previous prime is 21244364129. The next prime is 21244364173. The reversal of 21244364163 is 36146344212.

21244364163 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 4 + 3 + 641 + 6 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21244364163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244364123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107294670 + ... + 107294867.

It is an arithmetic number, because the mean of its divisors is an integer number (2789663994).

Almost surely, 2^21244364163 is an apocalyptic number.

21244364163 is a deficient number, since it is larger than the sum of its proper divisors (12231603765).

21244364163 is a wasteful number, since it uses less digits than its factorization.

21244364163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214589554 (or 214589551 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The spelling of 21244364163 in words is "twenty-one billion, two hundred forty-four million, three hundred sixty-four thousand, one hundred sixty-three".