203323031121 has 32 divisors (see below), whose sum is σ = 310820398848. Its totient is φ = 115811942400.

The previous prime is 203323031113. The next prime is 203323031129. The reversal of 203323031121 is 121130323302.

It is an interprime number because it is at equal distance from previous prime (203323031113) and next prime (203323031129).

It is not a de Polignac number, because 203323031121 - 2³ = 203323031113 is a prime.

It is a super-2 number, since 2×203323031121² (a number of 23 digits) contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203323031129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13339921 + ... + 13355153.

It is an arithmetic number, because the mean of its divisors is an integer number (9713137464).

Almost surely, 2^203323031121 is an apocalyptic number.

203323031121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203323031121 is a deficient number, since it is larger than the sum of its proper divisors (107497367727).

203323031121 is a wasteful number, since it uses less digits than its factorization.

203323031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17241.

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

Adding to 203323031121 its reverse (121130323302), we get a palindrome (324453354423).

The spelling of 203323031121 in words is "two hundred three billion, three hundred twenty-three million, thirty-one thousand, one hundred twenty-one".