20103202021 has 12 divisors (see below), whose sum is σ = 23485737132. Its totient is φ = 17157352128.

The previous prime is 20103202019. The next prime is 20103202033. The reversal of 20103202021 is 12020230102.

It can be written as a sum of positive squares in 2 ways, for example, as 6440865025 + 13662336996 = 80255^2 + 116886^2 .

It is not a de Polignac number, because 20103202021 - 2¹ = 20103202019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103201992 and 20103202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103205021) 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, 868990 + ... + 891823.

It is an arithmetic number, because the mean of its divisors is an integer number (1957144761).

Almost surely, 2^20103202021 is an apocalyptic number.

It is an amenable number.

20103202021 is a deficient number, since it is larger than the sum of its proper divisors (3382535111).

20103202021 is a wasteful number, since it uses less digits than its factorization.

20103202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761060 (or 1761053 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20103202021 its reverse (12020230102), we get a palindrome (32123432123).

The spelling of 20103202021 in words is "twenty billion, one hundred three million, two hundred two thousand, twenty-one".