20020201001261 has 2 divisors, whose sum is σ = 20020201001262. Its totient is φ = 20020201001260.

The previous prime is 20020201001237. The next prime is 20020201001263. The reversal of 20020201001261 is 16210010202002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18768554688361 + 1251646312900 = 4332269^2 + 1118770^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020201001261 - 2⁶ = 20020201001197 is a prime.

Together with 20020201001263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020201001263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010100500630 + 10010100500631.

It is an arithmetic number, because the mean of its divisors is an integer number (10010100500631).

Almost surely, 2^{20020201001261} is an apocalyptic number.

It is an amenable number.

20020201001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020201001261 is an equidigital number, since it uses as much as digits as its factorization.

20020201001261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20020201001261 its reverse (16210010202002), we get a palindrome (36230211203263).

The spelling of 20020201001261 in words is "twenty trillion, twenty billion, two hundred one million, one thousand, two hundred sixty-one".