21706347552 has 24 divisors (see below), whose sum is σ = 56979162576. Its totient is φ = 7235449152.

The previous prime is 21706347539. The next prime is 21706347569. The reversal of 21706347552 is 25574360712.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 113053798 + ... + 113053989.

It is an arithmetic number, because the mean of its divisors is an integer number (2374131774).

Almost surely, 2^21706347552 is an apocalyptic number.

It is an amenable number.

21706347552 is an abundant number, since it is smaller than the sum of its proper divisors (35272815024).

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

21706347552 is a wasteful number, since it uses less digits than its factorization.

21706347552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226107800 (or 226107792 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The spelling of 21706347552 in words is "twenty-one billion, seven hundred six million, three hundred forty-seven thousand, five hundred fifty-two".