203112311102321 has 4 divisors (see below), whose sum is σ = 211943281150272. Its totient is φ = 194281341054372.

The previous prime is 203112311102317. The next prime is 203112311102333. The reversal of 203112311102321 is 123201113211302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203112311102321 - 2² = 203112311102317 is a prime.

It is a super-2 number, since 2×203112311102321² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 8830970047927 = 203112311102321 / (2 + 0 + 3 + 1 + 1 + 2 + 3 + 1 + 1 + 1 + 0 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203112331102321) 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, 4415485023941 + ... + 4415485023986.

It is an arithmetic number, because the mean of its divisors is an integer number (52985820287568).

Almost surely, 2^{203112311102321} is an apocalyptic number.

It is an amenable number.

203112311102321 is a deficient number, since it is larger than the sum of its proper divisors (8830970047951).

203112311102321 is an equidigital number, since it uses as much as digits as its factorization.

203112311102321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8830970047950.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 203112311102321 its reverse (123201113211302), we get a palindrome (326313424313623).

The spelling of 203112311102321 in words is "two hundred three trillion, one hundred twelve billion, three hundred eleven million, one hundred two thousand, three hundred twenty-one".