21001200302321 has 4 divisors (see below), whose sum is σ = 21009305746944. Its totient is φ = 20993094857700.

The previous prime is 21001200302293. The next prime is 21001200302353. The reversal of 21001200302321 is 12320300210012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001200302321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001200302321.

It is not an unprimeable number, because it can be changed into a prime (21001200302371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4052718425 + ... + 4052723606.

It is an arithmetic number, because the mean of its divisors is an integer number (5252326436736).

Almost surely, 2^{21001200302321} is an apocalyptic number.

It is an amenable number.

21001200302321 is a deficient number, since it is larger than the sum of its proper divisors (8105444623).

21001200302321 is an equidigital number, since it uses as much as digits as its factorization.

21001200302321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8105444622.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21001200302321 its reverse (12320300210012), we get a palindrome (33321500512333).

The spelling of 21001200302321 in words is "twenty-one trillion, one billion, two hundred million, three hundred two thousand, three hundred twenty-one".