20440242101 has 2 divisors, whose sum is σ = 20440242102. Its totient is φ = 20440242100.

The previous prime is 20440242083. The next prime is 20440242127. The reversal of 20440242101 is 10124204402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11534545201 + 8905696900 = 107399^2 + 94370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440242101 - 2¹⁰ = 20440241077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440242701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220121050 + 10220121051.

It is an arithmetic number, because the mean of its divisors is an integer number (10220121051).

Almost surely, 2^20440242101 is an apocalyptic number.

It is an amenable number.

20440242101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440242101 is an equidigital number, since it uses as much as digits as its factorization.

20440242101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20440242101 its reverse (10124204402), we get a palindrome (30564446503).

The spelling of 20440242101 in words is "twenty billion, four hundred forty million, two hundred forty-two thousand, one hundred one".