21263646163 has 8 divisors (see below), whose sum is σ = 21678169968. Its totient is φ = 20849615904.

The previous prime is 21263646161. The next prime is 21263646167. The reversal of 21263646163 is 36164636212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21263646163 - 2¹ = 21263646161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21263646161) 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, 35781 + ... + 209302.

It is an arithmetic number, because the mean of its divisors is an integer number (2709771246).

Almost surely, 2^21263646163 is an apocalyptic number.

21263646163 is a deficient number, since it is larger than the sum of its proper divisors (414523805).

21263646163 is a wasteful number, since it uses less digits than its factorization.

21263646163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246773.

The product of its digits is 186624, while the sum is 40.

The spelling of 21263646163 in words is "twenty-one billion, two hundred sixty-three million, six hundred forty-six thousand, one hundred sixty-three".