201020021101 has 2 divisors, whose sum is σ = 201020021102. Its totient is φ = 201020021100.

The previous prime is 201020021089. The next prime is 201020021107. The reversal of 201020021101 is 101120020102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129463236100 + 71556785001 = 359810^2 + 267501^2 .

It is a cyclic number.

It is not a de Polignac number, because 201020021101 - 2⁹ = 201020020589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201020021107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510010550 + 100510010551.

It is an arithmetic number, because the mean of its divisors is an integer number (100510010551).

Almost surely, 2^201020021101 is an apocalyptic number.

It is an amenable number.

201020021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

201020021101 is an equidigital number, since it uses as much as digits as its factorization.

201020021101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201020021101 its reverse (101120020102), we get a palindrome (302140041203).

Subtracting from 201020021101 its reverse (101120020102), we obtain a palindrome (99900000999).

The spelling of 201020021101 in words is "two hundred one billion, twenty million, twenty-one thousand, one hundred one".