20011222002001 has 2 divisors, whose sum is σ = 20011222002002. Its totient is φ = 20011222002000.

The previous prime is 20011222001941. The next prime is 20011222002007. The reversal of 20011222002001 is 10020022211002.

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., 20005930894401 + 5291107600 = 4472799^2 + 72740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011222002001 - 2¹³ = 20011221993809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011222002007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005611001000 + 10005611001001.

It is an arithmetic number, because the mean of its divisors is an integer number (10005611001001).

Almost surely, 2^{20011222002001} is an apocalyptic number.

It is an amenable number.

20011222002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011222002001 is an equidigital number, since it uses as much as digits as its factorization.

20011222002001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20011222002001 its reverse (10020022211002), we get a palindrome (30031244213003).

The spelling of 20011222002001 in words is "twenty trillion, eleven billion, two hundred twenty-two million, two thousand, one".