21623355388 has 12 divisors (see below), whose sum is σ = 37864343160. Its totient is φ = 10804971632.

The previous prime is 21623355373. The next prime is 21623355409. The reversal of 21623355388 is 88355332612.

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 in 3 ways as a sum of consecutive naturals, for example, 1669258 + ... + 1682161.

It is an arithmetic number, because the mean of its divisors is an integer number (3155361930).

Almost surely, 2^21623355388 is an apocalyptic number.

It is an amenable number.

21623355388 is a deficient number, since it is larger than the sum of its proper divisors (16240987772).

21623355388 is a wasteful number, since it uses less digits than its factorization.

21623355388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353036 (or 3353034 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The spelling of 21623355388 in words is "twenty-one billion, six hundred twenty-three million, three hundred fifty-five thousand, three hundred eighty-eight".