312121203303 has 32 divisors (see below), whose sum is σ = 528721457152. Its totient is φ = 159324537600.

The previous prime is 312121203301. The next prime is 312121203319. The reversal of 312121203303 is 303302121213.

It is not a de Polignac number, because 312121203303 - 2¹ = 312121203301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 312121203303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121203301) 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 31 ways as a sum of consecutive naturals, for example, 18431878 + ... + 18448803.

It is an arithmetic number, because the mean of its divisors is an integer number (16522545536).

Almost surely, 2^312121203303 is an apocalyptic number.

312121203303 is a deficient number, since it is larger than the sum of its proper divisors (216600253849).

312121203303 is a wasteful number, since it uses less digits than its factorization.

312121203303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36880735.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 312121203303 its reverse (303302121213), we get a palindrome (615423324516).

The spelling of 312121203303 in words is "three hundred twelve billion, one hundred twenty-one million, two hundred three thousand, three hundred three".