21032344064 has 40 divisors (see below), whose sum is σ = 42036784548. Its totient is φ = 10512875520.

The previous prime is 21032344057. The next prime is 21032344117. The reversal of 21032344064 is 46044323012.

It can be written as a sum of positive squares in 2 ways, for example, as 14542430464 + 6489913600 = 120592^2 + 80560^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976824 + ... + 2983880.

Almost surely, 2^21032344064 is an apocalyptic number.

It is an amenable number.

21032344064 is a deficient number, since it is larger than the sum of its proper divisors (21004440484).

21032344064 is an frugal number, since it uses more digits than its factorization.

21032344064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12896 (or 12880 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21032344064 its reverse (46044323012), we get a palindrome (67076667076).

The spelling of 21032344064 in words is "twenty-one billion, thirty-two million, three hundred forty-four thousand, sixty-four".