321212103 has 4 divisors (see below), whose sum is σ = 428282808. Its totient is φ = 214141400.

The previous prime is 321212077. The next prime is 321212159. The reversal of 321212103 is 301212123.

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 321212103 - 2⁵ = 321212071 is a prime.

It is a super-2 number, since 2×321212103² = 206354430227365218, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321211103) 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, 53535348 + ... + 53535353.

It is an arithmetic number, because the mean of its divisors is an integer number (107070702).

Almost surely, 2^321212103 is an apocalyptic number.

321212103 is a deficient number, since it is larger than the sum of its proper divisors (107070705).

321212103 is a wasteful number, since it uses less digits than its factorization.

321212103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107070704.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 321212103 is about 17922.3911072156. The cubic root of 321212103 is about 684.8529017972.

Adding to 321212103 its reverse (301212123), we get a palindrome (622424226).

The spelling of 321212103 in words is "three hundred twenty-one million, two hundred twelve thousand, one hundred three".