21033948968 has 8 divisors (see below), whose sum is σ = 39438654330. Its totient is φ = 10516974480.

The previous prime is 21033948967. The next prime is 21033949009. The reversal of 21033948968 is 86984933012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12228378724 + 8805570244 = 110582^2 + 93838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21033948961) 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 as a sum of consecutive naturals, namely, 1314621803 + ... + 1314621818.

Almost surely, 2^21033948968 is an apocalyptic number.

It is an amenable number.

21033948968 is a deficient number, since it is larger than the sum of its proper divisors (18404705362).

21033948968 is a wasteful number, since it uses less digits than its factorization.

21033948968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629243627 (or 2629243623 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 21033948968 in words is "twenty-one billion, thirty-three million, nine hundred forty-eight thousand, nine hundred sixty-eight".