20424002161 has 2 divisors, whose sum is σ = 20424002162. Its totient is φ = 20424002160.

The previous prime is 20424002129. The next prime is 20424002191. The reversal of 20424002161 is 16120042402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20407551025 + 16451136 = 142855^2 + 4056^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424002161 - 2⁵ = 20424002129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424002191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212001080 + 10212001081.

It is an arithmetic number, because the mean of its divisors is an integer number (10212001081).

Almost surely, 2^20424002161 is an apocalyptic number.

It is an amenable number.

20424002161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424002161 is an equidigital number, since it uses as much as digits as its factorization.

20424002161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20424002161 its reverse (16120042402), we get a palindrome (36544044563).

The spelling of 20424002161 in words is "twenty billion, four hundred twenty-four million, two thousand, one hundred sixty-one".