312120111001 has 4 divisors (see below), whose sum is σ = 312255994932. Its totient is φ = 311984227072.

The previous prime is 312120110983. The next prime is 312120111059. The reversal of 312120111001 is 100111021213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100111021213 = 7 ⋅14301574459.

It can be written as a sum of positive squares in 2 ways, for example, as 117594126400 + 194525984601 = 342920^2 + 441051^2 .

It is a cyclic number.

It is not a de Polignac number, because 312120111001 - 2⁷ = 312120110873 is a prime.

It is a super-2 number, since 2×312120111001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312120111701) 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, 67938520 + ... + 67943113.

It is an arithmetic number, because the mean of its divisors is an integer number (78063998733).

Almost surely, 2^312120111001 is an apocalyptic number.

It is an amenable number.

312120111001 is a deficient number, since it is larger than the sum of its proper divisors (135883931).

312120111001 is a wasteful number, since it uses less digits than its factorization.

312120111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135883930.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 312120111001 its reverse (100111021213), we get a palindrome (412231132214).

The spelling of 312120111001 in words is "three hundred twelve billion, one hundred twenty million, one hundred eleven thousand, one".