203221131021 has 12 divisors (see below), whose sum is σ = 297676023840. Its totient is φ = 133572573960.

The previous prime is 203221131017. The next prime is 203221131023. The reversal of 203221131021 is 120131122302.

203221131021 is a `hidden beast` number, since 2 + 0 + 322 + 11 + 310 + 21 = 666.

It is not a de Polignac number, because 203221131021 - 2² = 203221131017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203221130985 and 203221131003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203221131023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159014331 + ... + 159015608.

It is an arithmetic number, because the mean of its divisors is an integer number (24806335320).

Almost surely, 2^203221131021 is an apocalyptic number.

It is an amenable number.

203221131021 is a deficient number, since it is larger than the sum of its proper divisors (94454892819).

203221131021 is a wasteful number, since it uses less digits than its factorization.

203221131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318030016 (or 318030013 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 203221131021 its reverse (120131122302), we get a palindrome (323352253323).

The spelling of 203221131021 in words is "two hundred three billion, two hundred twenty-one million, one hundred thirty-one thousand, twenty-one".