21788229834 has 24 divisors (see below), whose sum is σ = 53951807520. Its totient is φ = 6225208488.

The previous prime is 21788229833. The next prime is 21788229851. The reversal of 21788229834 is 43892288712.

It is not an unprimeable number, because it can be changed into a prime (21788229833) 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 11 ways as a sum of consecutive naturals, for example, 86461104 + ... + 86461355.

It is an arithmetic number, because the mean of its divisors is an integer number (2247991980).

Almost surely, 2^21788229834 is an apocalyptic number.

21788229834 is an abundant number, since it is smaller than the sum of its proper divisors (32163577686).

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

21788229834 is a wasteful number, since it uses less digits than its factorization.

21788229834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172922474 (or 172922471 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 21788229834 in words is "twenty-one billion, seven hundred eighty-eight million, two hundred twenty-nine thousand, eight hundred thirty-four".