20403221636101 has 2 divisors, whose sum is σ = 20403221636102. Its totient is φ = 20403221636100.

The previous prime is 20403221636029. The next prime is 20403221636111. The reversal of 20403221636101 is 10163612230402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15007868252001 + 5395353384100 = 3873999^2 + 2322790^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403221636101 - 2¹³ = 20403221627909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403221636111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201610818050 + 10201610818051.

It is an arithmetic number, because the mean of its divisors is an integer number (10201610818051).

Almost surely, 2^{20403221636101} is an apocalyptic number.

It is an amenable number.

20403221636101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403221636101 is an equidigital number, since it uses as much as digits as its factorization.

20403221636101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 20403221636101 its reverse (10163612230402), we get a palindrome (30566833866503).

The spelling of 20403221636101 in words is "twenty trillion, four hundred three billion, two hundred twenty-one million, six hundred thirty-six thousand, one hundred one".