21169171149 has 48 divisors (see below), whose sum is σ = 33654988800. Its totient is φ = 11797392096.

The previous prime is 21169171139. The next prime is 21169171217. The reversal of 21169171149 is 94117196112.

It is not a de Polignac number, because 21169171149 - 2⁹ = 21169170637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21169171149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169171109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1091862 + ... + 1111080.

It is an arithmetic number, because the mean of its divisors is an integer number (701145600).

Almost surely, 2^21169171149 is an apocalyptic number.

It is an amenable number.

21169171149 is a deficient number, since it is larger than the sum of its proper divisors (12485817651).

21169171149 is a wasteful number, since it uses less digits than its factorization.

21169171149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19422 (or 19415 counting only the distinct ones).

The product of its digits is 27216, while the sum is 42.

The spelling of 21169171149 in words is "twenty-one billion, one hundred sixty-nine million, one hundred seventy-one thousand, one hundred forty-nine".