20201220101 has 2 divisors, whose sum is σ = 20201220102. Its totient is φ = 20201220100.

The previous prime is 20201220041. The next prime is 20201220107. The reversal of 20201220101 is 10102210202.

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., 19937157601 + 264062500 = 141199^2 + 16250^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201220101 - 2²⁶ = 20134111237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201220107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100610050 + 10100610051.

It is an arithmetic number, because the mean of its divisors is an integer number (10100610051).

Almost surely, 2^20201220101 is an apocalyptic number.

It is an amenable number.

20201220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201220101 is an equidigital number, since it uses as much as digits as its factorization.

20201220101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20201220101 its reverse (10102210202), we get a palindrome (30303430303).

The spelling of 20201220101 in words is "twenty billion, two hundred one million, two hundred twenty thousand, one hundred one".