21120202231321 has 2 divisors, whose sum is σ = 21120202231322. Its totient is φ = 21120202231320.

The previous prime is 21120202231309. The next prime is 21120202231333. The reversal of 21120202231321 is 12313220202112.

It is a balanced prime because it is at equal distance from previous prime (21120202231309) and next prime (21120202231333).

It can be written as a sum of positive squares in only one way, i.e., 12243973741321 + 8876228490000 = 3499139^2 + 2979300^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120202231321 - 2²¹ = 21120200134169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120202231292 and 21120202231301.

It is not a weakly prime, because it can be changed into another prime (21120202231021) 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 as a sum of consecutive naturals, namely, 10560101115660 + 10560101115661.

It is an arithmetic number, because the mean of its divisors is an integer number (10560101115661).

Almost surely, 2^{21120202231321} is an apocalyptic number.

It is an amenable number.

21120202231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120202231321 is an equidigital number, since it uses as much as digits as its factorization.

21120202231321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21120202231321 its reverse (12313220202112), we get a palindrome (33433422433433).

The spelling of 21120202231321 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, two hundred thirty-one thousand, three hundred twenty-one".