21122113223 has 4 divisors (see below), whose sum is σ = 21200634360. Its totient is φ = 21043592088.

The previous prime is 21122113219. The next prime is 21122113231. The reversal of 21122113223 is 32231122112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122113223 - 2² = 21122113219 is a prime.

It is a super-2 number, since 2×21122113223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122113195 and 21122113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122113423) 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, 39260165 + ... + 39260702.

It is an arithmetic number, because the mean of its divisors is an integer number (5300158590).

Almost surely, 2^21122113223 is an apocalyptic number.

21122113223 is a deficient number, since it is larger than the sum of its proper divisors (78521137).

21122113223 is an equidigital number, since it uses as much as digits as its factorization.

21122113223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78521136.

The product of its digits is 288, while the sum is 20.

Adding to 21122113223 its reverse (32231122112), we get a palindrome (53353235335).

The spelling of 21122113223 in words is "twenty-one billion, one hundred twenty-two million, one hundred thirteen thousand, two hundred twenty-three".