21380133163 has 4 divisors (see below), whose sum is σ = 21650767840. Its totient is φ = 21109498488.

The previous prime is 21380133149. The next prime is 21380133179. The reversal of 21380133163 is 36133108312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21380133163 is a prime.

It is a super-2 number, since 2×21380133163² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21380134163) 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, 135317220 + ... + 135317377.

It is an arithmetic number, because the mean of its divisors is an integer number (5412691960).

Almost surely, 2^21380133163 is an apocalyptic number.

21380133163 is a deficient number, since it is larger than the sum of its proper divisors (270634677).

21380133163 is an equidigital number, since it uses as much as digits as its factorization.

21380133163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270634676.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 21380133163 in words is "twenty-one billion, three hundred eighty million, one hundred thirty-three thousand, one hundred sixty-three".