21716561151 has 6 divisors (see below), whose sum is σ = 31368366120. Its totient is φ = 14477707428.

The previous prime is 21716561149. The next prime is 21716561159. The reversal of 21716561151 is 15116561712.

21716561151 is a `hidden beast` number, since 21 + 7 + 16 + 5 + 611 + 5 + 1 = 666.

It is not a de Polignac number, because 21716561151 - 2¹ = 21716561149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716561159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1206475611 + ... + 1206475628.

It is an arithmetic number, because the mean of its divisors is an integer number (5228061020).

Almost surely, 2^21716561151 is an apocalyptic number.

21716561151 is a deficient number, since it is larger than the sum of its proper divisors (9651804969).

21716561151 is a wasteful number, since it uses less digits than its factorization.

21716561151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412951245 (or 2412951242 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The spelling of 21716561151 in words is "twenty-one billion, seven hundred sixteen million, five hundred sixty-one thousand, one hundred fifty-one".