203124410021 has 16 divisors (see below), whose sum is σ = 222365069808. Its totient is φ = 184401100800.

The previous prime is 203124410009. The next prime is 203124410107. The reversal of 203124410021 is 120014421302.

It can be written as a sum of positive squares in 8 ways, for example, as 121459917121 + 81664492900 = 348511^2 + 285770^2 .

It is a cyclic number.

It is not a de Polignac number, because 203124410021 - 2¹⁰ = 203124408997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203124409975 and 203124410002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203124416021) 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, 8804261 + ... + 8827301.

It is an arithmetic number, because the mean of its divisors is an integer number (13897816863).

Almost surely, 2^203124410021 is an apocalyptic number.

It is an amenable number.

203124410021 is a deficient number, since it is larger than the sum of its proper divisors (19240659787).

203124410021 is a wasteful number, since it uses less digits than its factorization.

203124410021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34232.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 203124410021 its reverse (120014421302), we get a palindrome (323138831323).

The spelling of 203124410021 in words is "two hundred three billion, one hundred twenty-four million, four hundred ten thousand, twenty-one".