203123132121 has 32 divisors (see below), whose sum is σ = 347822899200. Its totient is φ = 102483526464.

The previous prime is 203123132119. The next prime is 203123132137. The reversal of 203123132121 is 121231321302.

203123132121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 203123132121 - 2¹ = 203123132119 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (203123132111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16168521 + ... + 16181078.

It is an arithmetic number, because the mean of its divisors is an integer number (10869465600).

Almost surely, 2^203123132121 is an apocalyptic number.

203123132121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203123132121 is a deficient number, since it is larger than the sum of its proper divisors (144699767079).

203123132121 is a wasteful number, since it uses less digits than its factorization.

203123132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32349645.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 203123132121 its reverse (121231321302), we get a palindrome (324354453423).

The spelling of 203123132121 in words is "two hundred three billion, one hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-one".