21202122121321 has 4 divisors (see below), whose sum is σ = 21290833929600. Its totient is φ = 21113410313044.

The previous prime is 21202122121291. The next prime is 21202122121333. The reversal of 21202122121321 is 12312122120212.

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 21202122121321 - 2³⁷ = 21064683167849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202122121292 and 21202122121301.

It is not an unprimeable number, because it can be changed into a prime (21202122121361) 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 3 ways as a sum of consecutive naturals, for example, 44355903781 + ... + 44355904258.

It is an arithmetic number, because the mean of its divisors is an integer number (5322708482400).

Almost surely, 2^{21202122121321} is an apocalyptic number.

It is an amenable number.

21202122121321 is a deficient number, since it is larger than the sum of its proper divisors (88711808279).

21202122121321 is an equidigital number, since it uses as much as digits as its factorization.

21202122121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88711808278.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21202122121321 its reverse (12312122120212), we get a palindrome (33514244241533).

The spelling of 21202122121321 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, one hundred twenty-one thousand, three hundred twenty-one".