21002021302321 has 4 divisors (see below), whose sum is σ = 21025806151792. Its totient is φ = 20978236452852.

The previous prime is 21002021302259. The next prime is 21002021302331. The reversal of 21002021302321 is 12320312020012.

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 not a de Polignac number, because 21002021302321 - 2²⁹ = 21001484431409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002021302331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11892423411 + ... + 11892425176.

It is an arithmetic number, because the mean of its divisors is an integer number (5256451537948).

Almost surely, 2^{21002021302321} is an apocalyptic number.

It is an amenable number.

21002021302321 is a deficient number, since it is larger than the sum of its proper divisors (23784849471).

21002021302321 is an equidigital number, since it uses as much as digits as its factorization.

21002021302321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23784849470.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21002021302321 its reverse (12320312020012), we get a palindrome (33322333322333).

The spelling of 21002021302321 in words is "twenty-one trillion, two billion, twenty-one million, three hundred two thousand, three hundred twenty-one".