20210220111001 has 2 divisors, whose sum is σ = 20210220111002. Its totient is φ = 20210220111000.

The previous prime is 20210220110939. The next prime is 20210220111017. The reversal of 20210220111001 is 10011102201202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20206508377225 + 3711733776 = 4495165^2 + 60924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210220111001 - 2¹⁵ = 20210220078233 is a prime.

It is a super-2 number, since 2×20210220111001² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210220114001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105110055500 + 10105110055501.

It is an arithmetic number, because the mean of its divisors is an integer number (10105110055501).

Almost surely, 2^{20210220111001} is an apocalyptic number.

It is an amenable number.

20210220111001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210220111001 is an equidigital number, since it uses as much as digits as its factorization.

20210220111001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20210220111001 its reverse (10011102201202), we get a palindrome (30221322312203).

The spelling of 20210220111001 in words is "twenty trillion, two hundred ten billion, two hundred twenty million, one hundred eleven thousand, one".