21100223203321 has 2 divisors, whose sum is σ = 21100223203322. Its totient is φ = 21100223203320.

The previous prime is 21100223203303. The next prime is 21100223203331. The reversal of 21100223203321 is 12330232200112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10841142322921 + 10259080880400 = 3292589^2 + 3202980^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100223203321 - 2¹⁷ = 21100223072249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100223203292 and 21100223203301.

It is not a weakly prime, because it can be changed into another prime (21100223203331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550111601660 + 10550111601661.

It is an arithmetic number, because the mean of its divisors is an integer number (10550111601661).

Almost surely, 2^{21100223203321} is an apocalyptic number.

It is an amenable number.

21100223203321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100223203321 is an equidigital number, since it uses as much as digits as its factorization.

21100223203321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21100223203321 its reverse (12330232200112), we get a palindrome (33430455403433).

The spelling of 21100223203321 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred three thousand, three hundred twenty-one".