202101101021 has 2 divisors, whose sum is σ = 202101101022. Its totient is φ = 202101101020.

The previous prime is 202101100987. The next prime is 202101101023. The reversal of 202101101021 is 120101101202.

202101101021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188642548900 + 13458552121 = 434330^2 + 116011^2 .

It is a cyclic number.

It is not a de Polignac number, because 202101101021 - 2¹⁰ = 202101099997 is a prime.

Together with 202101101023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202101100993 and 202101101011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202101101023) 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, 101050550510 + 101050550511.

It is an arithmetic number, because the mean of its divisors is an integer number (101050550511).

Almost surely, 2^202101101021 is an apocalyptic number.

It is an amenable number.

202101101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202101101021 is an equidigital number, since it uses as much as digits as its factorization.

202101101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 202101101021 its reverse (120101101202), we get a palindrome (322202202223).

The spelling of 202101101021 in words is "two hundred two billion, one hundred one million, one hundred one thousand, twenty-one".