21193929392 has 20 divisors (see below), whose sum is σ = 43224461880. Its totient is φ = 10039229568.

The previous prime is 21193929391. The next prime is 21193929403. The reversal of 21193929392 is 29392939112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21193929392.

It is not an unprimeable number, because it can be changed into a prime (21193929391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34858133 + ... + 34858740.

It is an arithmetic number, because the mean of its divisors is an integer number (2161223094).

Almost surely, 2^21193929392 is an apocalyptic number.

It is an amenable number.

21193929392 is an abundant number, since it is smaller than the sum of its proper divisors (22030532488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21193929392 is a wasteful number, since it uses less digits than its factorization.

21193929392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69716900 (or 69716894 counting only the distinct ones).

The product of its digits is 472392, while the sum is 50.

The spelling of 21193929392 in words is "twenty-one billion, one hundred ninety-three million, nine hundred twenty-nine thousand, three hundred ninety-two".