1020203230021 has 4 divisors (see below), whose sum is σ = 1020371781132. Its totient is φ = 1020034678912.

The previous prime is 1020203230001. The next prime is 1020203230073. The reversal of 1020203230021 is 1200323020201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318277633921 + 701925596100 = 564161^2 + 837810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020203230021 - 2¹⁹ = 1020202705733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020203229977 and 1020203230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020203230001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84266476 + ... + 84278581.

It is an arithmetic number, because the mean of its divisors is an integer number (255092945283).

Almost surely, 2^{1020203230021} is an apocalyptic number.

It is an amenable number.

1020203230021 is a deficient number, since it is larger than the sum of its proper divisors (168551111).

1020203230021 is an equidigital number, since it uses as much as digits as its factorization.

1020203230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168551110.

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

Adding to 1020203230021 its reverse (1200323020201), we get a palindrome (2220526250222).

The spelling of 1020203230021 in words is "one trillion, twenty billion, two hundred three million, two hundred thirty thousand, twenty-one".