21121034223 has 4 divisors (see below), whose sum is σ = 28161378968. Its totient is φ = 14080689480.

The previous prime is 21121034189. The next prime is 21121034227. The reversal of 21121034223 is 32243012112.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21121034223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121034223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121034227) 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 in 3 ways as a sum of consecutive naturals, for example, 3520172368 + ... + 3520172373.

It is an arithmetic number, because the mean of its divisors is an integer number (7040344742).

Almost surely, 2^21121034223 is an apocalyptic number.

21121034223 is a deficient number, since it is larger than the sum of its proper divisors (7040344745).

21121034223 is an equidigital number, since it uses as much as digits as its factorization.

21121034223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040344744.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21121034223 its reverse (32243012112), we get a palindrome (53364046335).

The spelling of 21121034223 in words is "twenty-one billion, one hundred twenty-one million, thirty-four thousand, two hundred twenty-three".