203112321100021 has 8 divisors (see below), whose sum is σ = 214736078391200. Its totient is φ = 191581927321680.

The previous prime is 203112321100019. The next prime is 203112321100063. The reversal of 203112321100021 is 120001123211302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 203112321100021 - 2¹ = 203112321100019 is a prime.

It is a super-2 number, since 2×203112321100021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203112321100121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23340873735 + ... + 23340882436.

It is an arithmetic number, because the mean of its divisors is an integer number (26842009798900).

Almost surely, 2^{203112321100021} is an apocalyptic number.

It is an amenable number.

203112321100021 is a deficient number, since it is larger than the sum of its proper divisors (11623757291179).

203112321100021 is a wasteful number, since it uses less digits than its factorization.

203112321100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46681756419.

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

Adding to 203112321100021 its reverse (120001123211302), we get a palindrome (323113444311323).

The spelling of 203112321100021 in words is "two hundred three trillion, one hundred twelve billion, three hundred twenty-one million, one hundred thousand, twenty-one".