203075021 has 16 divisors (see below), whose sum is σ = 218211840. Its totient is φ = 188426160.

The previous prime is 203075011. The next prime is 203075053. The reversal of 203075021 is 120570302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203075021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203074984 and 203075002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203075011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206096 + ... + 207078.

It is an arithmetic number, because the mean of its divisors is an integer number (13638240).

Almost surely, 2^203075021 is an apocalyptic number.

It is an amenable number.

203075021 is a deficient number, since it is larger than the sum of its proper divisors (15136819).

203075021 is a wasteful number, since it uses less digits than its factorization.

203075021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 203075021 is about 14250.4393265611. The cubic root of 203075021 is about 587.7854557267.

The spelling of 203075021 in words is "two hundred three million, seventy-five thousand, twenty-one".