21033525064 has 16 divisors (see below), whose sum is σ = 39501787500. Its totient is φ = 10499715072.

The previous prime is 21033525061. The next prime is 21033525119. The reversal of 21033525064 is 46052533012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19000416964 + 2033108100 = 137842^2 + 45090^2 .

It is not an unprimeable number, because it can be changed into a prime (21033525061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125689 + ... + 2135560.

Almost surely, 2^21033525064 is an apocalyptic number.

It is an amenable number.

21033525064 is a deficient number, since it is larger than the sum of its proper divisors (18468262436).

21033525064 is a wasteful number, since it uses less digits than its factorization.

21033525064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261872 (or 4261868 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 21033525064 in words is "twenty-one billion, thirty-three million, five hundred twenty-five thousand, sixty-four".