21184227388 has 6 divisors (see below), whose sum is σ = 37072397936. Its totient is φ = 10592113692.

The previous prime is 21184227377. The next prime is 21184227401. The reversal of 21184227388 is 88372248112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2648028420 + ... + 2648028427.

Almost surely, 2^21184227388 is an apocalyptic number.

It is an amenable number.

21184227388 is a deficient number, since it is larger than the sum of its proper divisors (15888170548).

21184227388 is a wasteful number, since it uses less digits than its factorization.

21184227388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296056851 (or 5296056849 counting only the distinct ones).

The product of its digits is 344064, while the sum is 46.

The spelling of 21184227388 in words is "twenty-one billion, one hundred eighty-four million, two hundred twenty-seven thousand, three hundred eighty-eight".