21330406052 has 24 divisors (see below), whose sum is σ = 37914494016. Its totient is φ = 10498622688.

The previous prime is 21330406051. The next prime is 21330406067. The reversal of 21330406052 is 25060403312.

It is not an unprimeable number, because it can be changed into a prime (21330406051) 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 7 ways as a sum of consecutive naturals, for example, 24008 + ... + 207935.

It is an arithmetic number, because the mean of its divisors is an integer number (1579770584).

Almost surely, 2^21330406052 is an apocalyptic number.

It is an amenable number.

21330406052 is a deficient number, since it is larger than the sum of its proper divisors (16584087964).

21330406052 is a wasteful number, since it uses less digits than its factorization.

21330406052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232307 (or 232305 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21330406052 its reverse (25060403312), we get a palindrome (46390809364).

The spelling of 21330406052 in words is "twenty-one billion, three hundred thirty million, four hundred six thousand, fifty-two".