16215312771 has 24 divisors (see below), whose sum is σ = 27390654720. Its totient is φ = 9050405616.

The previous prime is 16215312769. The next prime is 16215312787. The reversal of 16215312771 is 17721351261.

16215312771 is a `hidden beast` number, since 1 + 621 + 5 + 3 + 1 + 27 + 7 + 1 = 666.

It is not a de Polignac number, because 16215312771 - 2¹ = 16215312769 is a prime.

It is a super-2 number, since 2×16215312771² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16215312721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2990151 + ... + 2995568.

It is an arithmetic number, because the mean of its divisors is an integer number (1141277280).

Almost surely, 2^16215312771 is an apocalyptic number.

16215312771 is a deficient number, since it is larger than the sum of its proper divisors (11175341949).

16215312771 is a wasteful number, since it uses less digits than its factorization.

16215312771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5985775 (or 5985772 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The spelling of 16215312771 in words is "sixteen billion, two hundred fifteen million, three hundred twelve thousand, seven hundred seventy-one".