203044121021 has 4 divisors (see below), whose sum is σ = 232050424032. Its totient is φ = 174037818012.

The previous prime is 203044120997. The next prime is 203044121047. The reversal of 203044121021 is 120121440302.

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 a de Polignac number, because none of the positive numbers 2^k-203044121021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203044120984 and 203044121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203044121051) 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, 14503151495 + ... + 14503151508.

It is an arithmetic number, because the mean of its divisors is an integer number (58012606008).

Almost surely, 2^203044121021 is an apocalyptic number.

It is an amenable number.

203044121021 is a deficient number, since it is larger than the sum of its proper divisors (29006303011).

203044121021 is an equidigital number, since it uses as much as digits as its factorization.

203044121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29006303010.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 203044121021 its reverse (120121440302), we get a palindrome (323165561323).

The spelling of 203044121021 in words is "two hundred three billion, forty-four million, one hundred twenty-one thousand, twenty-one".