123221131211 has 4 divisors (see below), whose sum is σ = 123253741800. Its totient is φ = 123188520624.

The previous prime is 123221131157. The next prime is 123221131217. The reversal of 123221131211 is 112131122321.

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 123221131211 - 2³⁴ = 106041262027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123221131217) 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, 16299626 + ... + 16307183.

It is an arithmetic number, because the mean of its divisors is an integer number (30813435450).

Almost surely, 2^123221131211 is an apocalyptic number.

123221131211 is a deficient number, since it is larger than the sum of its proper divisors (32610589).

123221131211 is an equidigital number, since it uses as much as digits as its factorization.

123221131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32610588.

The product of its digits is 144, while the sum is 20.

Adding to 123221131211 its reverse (112131122321), we get a palindrome (235352253532).

The spelling of 123221131211 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred eleven".