21121110223 has 2 divisors, whose sum is σ = 21121110224. Its totient is φ = 21121110222.

The previous prime is 21121110211. The next prime is 21121110253. The reversal of 21121110223 is 32201112112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121110223 is a prime.

It is a super-2 number, since 2×21121110223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121110197 and 21121110206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121110253) 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 as a sum of consecutive naturals, namely, 10560555111 + 10560555112.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555112).

Almost surely, 2^21121110223 is an apocalyptic number.

21121110223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121110223 is an equidigital number, since it uses as much as digits as its factorization.

21121110223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21121110223 its reverse (32201112112), we get a palindrome (53322222335).

The spelling of 21121110223 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty-three".