203021011021 has 8 divisors (see below), whose sum is σ = 214973024760. Its totient is φ = 191070064128.

The previous prime is 203021011019. The next prime is 203021011043. The reversal of 203021011021 is 120110120302.

It can be written as a sum of positive squares in 4 ways, for example, as 6887174121 + 196133836900 = 82989^2 + 442870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203021011021 - 2¹ = 203021011019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203021010992 and 203021011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021011091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143095 + ... + 653083.

It is an arithmetic number, because the mean of its divisors is an integer number (26871628095).

Almost surely, 2^203021011021 is an apocalyptic number.

It is an amenable number.

203021011021 is a deficient number, since it is larger than the sum of its proper divisors (11952013739).

203021011021 is a wasteful number, since it uses less digits than its factorization.

203021011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533423.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 203021011021 its reverse (120110120302), we get a palindrome (323131131323).

The spelling of 203021011021 in words is "two hundred three billion, twenty-one million, eleven thousand, twenty-one".