312121011223 has 4 divisors (see below), whose sum is σ = 356709727120. Its totient is φ = 267532295328.

The previous prime is 312121011221. The next prime is 312121011271. The reversal of 312121011223 is 322110121213.

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 312121011223 - 2¹ = 312121011221 is a prime.

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 312121011223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121011221) 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, 22294357938 + ... + 22294357951.

It is an arithmetic number, because the mean of its divisors is an integer number (89177431780).

Almost surely, 2^312121011223 is an apocalyptic number.

312121011223 is a deficient number, since it is larger than the sum of its proper divisors (44588715897).

312121011223 is an equidigital number, since it uses as much as digits as its factorization.

312121011223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44588715896.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312121011223 its reverse (322110121213), we get a palindrome (634231132436).

The spelling of 312121011223 in words is "three hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred twenty-three".