201101221021 has 2 divisors, whose sum is σ = 201101221022. Its totient is φ = 201101221020.

The previous prime is 201101221019. The next prime is 201101221109. The reversal of 201101221021 is 120122101102.

201101221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184547568100 + 16553652921 = 429590^2 + 128661^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101221021 - 2¹ = 201101221019 is a prime.

It is a super-2 number, since 2×201101221021² (a number of 23 digits) contains 22 as substring.

Together with 201101221019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 201101220992 and 201101221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201101281021) 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, 100550610510 + 100550610511.

It is an arithmetic number, because the mean of its divisors is an integer number (100550610511).

Almost surely, 2^201101221021 is an apocalyptic number.

It is an amenable number.

201101221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101221021 is an equidigital number, since it uses as much as digits as its factorization.

201101221021 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 201101221021 its reverse (120122101102), we get a palindrome (321223322123).

The spelling of 201101221021 in words is "two hundred one billion, one hundred one million, two hundred twenty-one thousand, twenty-one".