21360612163 has 4 divisors (see below), whose sum is σ = 23302486008. Its totient is φ = 19418738320.

The previous prime is 21360612127. The next prime is 21360612179. The reversal of 21360612163 is 36121606312.

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 21360612163 - 2¹⁷ = 21360481091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21360612113) 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, 970936906 + ... + 970936927.

It is an arithmetic number, because the mean of its divisors is an integer number (5825621502).

Almost surely, 2^21360612163 is an apocalyptic number.

21360612163 is a deficient number, since it is larger than the sum of its proper divisors (1941873845).

21360612163 is a wasteful number, since it uses less digits than its factorization.

21360612163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941873844.

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

The spelling of 21360612163 in words is "twenty-one billion, three hundred sixty million, six hundred twelve thousand, one hundred sixty-three".