21202021111321 has 2 divisors, whose sum is σ = 21202021111322. Its totient is φ = 21202021111320.

The previous prime is 21202021111307. The next prime is 21202021111433. The reversal of 21202021111321 is 12311112020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20778454438921 + 423566672400 = 4558339^2 + 650820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202021111321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202021114321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601010555660 + 10601010555661.

It is an arithmetic number, because the mean of its divisors is an integer number (10601010555661).

Almost surely, 2^{21202021111321} is an apocalyptic number.

It is an amenable number.

21202021111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202021111321 is an equidigital number, since it uses as much as digits as its factorization.

21202021111321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21202021111321 its reverse (12311112020212), we get a palindrome (33513133131533).

The spelling of 21202021111321 in words is "twenty-one trillion, two hundred two billion, twenty-one million, one hundred eleven thousand, three hundred twenty-one".