21734320788 has 30 divisors (see below), whose sum is σ = 56817808586. Its totient is φ = 7244773488.

The previous prime is 21734320771. The next prime is 21734320793. The reversal of 21734320788 is 88702343712.

21734320788 is a `hidden beast` number, since 21 + 7 + 343 + 207 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15578035344 + 6156285444 = 124812^2 + 78462^2 .

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 9 ways as a sum of consecutive naturals, for example, 33540295 + ... + 33540942.

Almost surely, 2^21734320788 is an apocalyptic number.

It is an amenable number.

21734320788 is an abundant number, since it is smaller than the sum of its proper divisors (35083487798).

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

21734320788 is a wasteful number, since it uses less digits than its factorization.

21734320788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67081253 (or 67081242 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 21734320788 in words is "twenty-one billion, seven hundred thirty-four million, three hundred twenty thousand, seven hundred eighty-eight".