203222031021 has 24 divisors (see below), whose sum is σ = 294719623224. Its totient is φ = 134939105280.

The previous prime is 203222030983. The next prime is 203222031031. The reversal of 203222031021 is 120130222302.

It can be written as a sum of positive squares in 4 ways, for example, as 29795592996 + 173426438025 = 172614^2 + 416445^2 .

It is not a de Polignac number, because 203222031021 - 2¹⁸ = 203221768877 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 203222030985 and 203222031003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203222031031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2928951 + ... + 2997531.

It is an arithmetic number, because the mean of its divisors is an integer number (12279984301).

Almost surely, 2^203222031021 is an apocalyptic number.

It is an amenable number.

203222031021 is a deficient number, since it is larger than the sum of its proper divisors (91497592203).

203222031021 is a wasteful number, since it uses less digits than its factorization.

203222031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69901 (or 69898 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 203222031021 its reverse (120130222302), we get a palindrome (323352253323).

The spelling of 203222031021 in words is "two hundred three billion, two hundred twenty-two million, thirty-one thousand, twenty-one".