123112200221 has 4 divisors (see below), whose sum is σ = 124846174944. Its totient is φ = 121378225500.

The previous prime is 123112200179. The next prime is 123112200247. The reversal of 123112200221 is 122002211321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123112200221 is a prime.

It is a super-2 number, since 2×123112200221² (a number of 23 digits) contains 22 as substring.

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 123112200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123112200271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866987255 + ... + 866987396.

It is an arithmetic number, because the mean of its divisors is an integer number (31211543736).

Almost surely, 2^123112200221 is an apocalyptic number.

It is an amenable number.

123112200221 is a deficient number, since it is larger than the sum of its proper divisors (1733974723).

123112200221 is an equidigital number, since it uses as much as digits as its factorization.

123112200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733974722.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 123112200221 its reverse (122002211321), we get a palindrome (245114411542).

The spelling of 123112200221 in words is "one hundred twenty-three billion, one hundred twelve million, two hundred thousand, two hundred twenty-one".