123111211321 has 8 divisors (see below), whose sum is σ = 140706361664. Its totient is φ = 105518019600.

The previous prime is 123111211313. The next prime is 123111211331. The reversal of 123111211321 is 123112111321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123111211321 - 2³ = 123111211313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123111211331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352395 + ... + 608608.

It is an arithmetic number, because the mean of its divisors is an integer number (17588295208).

Almost surely, 2^123111211321 is an apocalyptic number.

It is an amenable number.

123111211321 is a deficient number, since it is larger than the sum of its proper divisors (17595150343).

123111211321 is an equidigital number, since it uses as much as digits as its factorization.

123111211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979311.

The product of its digits is 72, while the sum is 19.

Adding to 123111211321 its reverse (123112111321), we get a palindrome (246223322642).

The spelling of 123111211321 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred eleven thousand, three hundred twenty-one".