21300021332 has 24 divisors (see below), whose sum is σ = 39239919936. Its totient is φ = 10096811648.

The previous prime is 21300021331. The next prime is 21300021343. The reversal of 21300021332 is 23312000312.

It is a self number, because there is not a number n which added to its sum of digits gives 21300021332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300021331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1014038 + ... + 1034829.

It is an arithmetic number, because the mean of its divisors is an integer number (1634996664).

Almost surely, 2^21300021332 is an apocalyptic number.

It is an amenable number.

21300021332 is a deficient number, since it is larger than the sum of its proper divisors (17939898604).

21300021332 is a wasteful number, since it uses less digits than its factorization.

21300021332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049007 (or 2049005 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21300021332 its reverse (23312000312), we get a palindrome (44612021644).

The spelling of 21300021332 in words is "twenty-one billion, three hundred million, twenty-one thousand, three hundred thirty-two".