20203021212161 has 2 divisors, whose sum is σ = 20203021212162. Its totient is φ = 20203021212160.

The previous prime is 20203021212107. The next prime is 20203021212203. The reversal of 20203021212161 is 16121212030202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15886848760561 + 4316172451600 = 3985831^2 + 2077540^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203021212161 - 2³⁰ = 20201947470337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203021212061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101510606080 + 10101510606081.

It is an arithmetic number, because the mean of its divisors is an integer number (10101510606081).

Almost surely, 2^{20203021212161} is an apocalyptic number.

It is an amenable number.

20203021212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203021212161 is an equidigital number, since it uses as much as digits as its factorization.

20203021212161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20203021212161 its reverse (16121212030202), we get a palindrome (36324233242363).

The spelling of 20203021212161 in words is "twenty trillion, two hundred three billion, twenty-one million, two hundred twelve thousand, one hundred sixty-one".