21158177092 has 24 divisors (see below), whose sum is σ = 41973713600. Its totient is φ = 9251348256.

The previous prime is 21158177083. The next prime is 21158177093. The reversal of 21158177092 is 29077185112.

It is not an unprimeable number, because it can be changed into a prime (21158177093) 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 7 ways as a sum of consecutive naturals, for example, 10706592 + ... + 10708567.

Almost surely, 2^21158177092 is an apocalyptic number.

It is an amenable number.

21158177092 is a deficient number, since it is larger than the sum of its proper divisors (20815536508).

21158177092 is a wasteful number, since it uses less digits than its factorization.

21158177092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21415195 (or 21415193 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 21158177092 in words is "twenty-one billion, one hundred fifty-eight million, one hundred seventy-seven thousand, ninety-two".