21713050161 has 64 divisors (see below), whose sum is σ = 35384801280. Its totient is φ = 13050072000.

The previous prime is 21713050159. The next prime is 21713050169. The reversal of 21713050161 is 16105031712.

21713050161 is a `hidden beast` number, since 2 + 1 + 71 + 30 + 501 + 61 = 666.

It is not a de Polignac number, because 21713050161 - 2¹ = 21713050159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21713050169) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26382396 + ... + 26383218.

It is an arithmetic number, because the mean of its divisors is an integer number (552887520).

Almost surely, 2^21713050161 is an apocalyptic number.

It is an amenable number.

21713050161 is a deficient number, since it is larger than the sum of its proper divisors (13671751119).

21713050161 is a wasteful number, since it uses less digits than its factorization.

21713050161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

Adding to 21713050161 its reverse (16105031712), we get a palindrome (37818081873).

The spelling of 21713050161 in words is "twenty-one billion, seven hundred thirteen million, fifty thousand, one hundred sixty-one".