211222221220123 has 4 divisors (see below), whose sum is σ = 211222884910320. Its totient is φ = 211221557529928.

The previous prime is 211222221220099. The next prime is 211222221220159. The reversal of 211222221220123 is 321022122222112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222221220123 is a prime.

It is a super-2 number, since 2×211222221220123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211222221220193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331367488 + ... + 332004301.

It is an arithmetic number, because the mean of its divisors is an integer number (52805721227580).

Almost surely, 2^{211222221220123} is an apocalyptic number.

211222221220123 is a deficient number, since it is larger than the sum of its proper divisors (663690197).

211222221220123 is an equidigital number, since it uses as much as digits as its factorization.

211222221220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663690196.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 211222221220123 its reverse (321022122222112), we get a palindrome (532244343442235).

The spelling of 211222221220123 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-three".