203201320021 has 16 divisors (see below), whose sum is σ = 239762792448. Its totient is φ = 168524967600.

The previous prime is 203201320013. The next prime is 203201320031. The reversal of 203201320021 is 120023102302.

It is a cyclic number.

It is not a de Polignac number, because 203201320021 - 2³ = 203201320013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203201319977 and 203201320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203201320031) 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, 1226496 + ... + 1382278.

It is an arithmetic number, because the mean of its divisors is an integer number (14985174528).

Almost surely, 2^203201320021 is an apocalyptic number.

It is an amenable number.

203201320021 is a deficient number, since it is larger than the sum of its proper divisors (36561472427).

203201320021 is a wasteful number, since it uses less digits than its factorization.

203201320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161832.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 203201320021 its reverse (120023102302), we get a palindrome (323224422323).

The spelling of 203201320021 in words is "two hundred three billion, two hundred one million, three hundred twenty thousand, twenty-one".