21163938363 has 8 divisors (see below), whose sum is σ = 31353982800. Its totient is φ = 14109292224.

The previous prime is 21163938353. The next prime is 21163938371. The reversal of 21163938363 is 36383936112.

21163938363 is a `hidden beast` number, since 2 + 1 + 1 + 639 + 3 + 8 + 3 + 6 + 3 = 666.

It is not a de Polignac number, because 21163938363 - 2⁵ = 21163938331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21163938353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391924758 + ... + 391924811.

It is an arithmetic number, because the mean of its divisors is an integer number (3919247850).

Almost surely, 2^21163938363 is an apocalyptic number.

21163938363 is a deficient number, since it is larger than the sum of its proper divisors (10190044437).

21163938363 is an equidigital number, since it uses as much as digits as its factorization.

21163938363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783849578 (or 783849572 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The spelling of 21163938363 in words is "twenty-one billion, one hundred sixty-three million, nine hundred thirty-eight thousand, three hundred sixty-three".