21210222020101 has 2 divisors, whose sum is σ = 21210222020102. Its totient is φ = 21210222020100.

The previous prime is 21210222020083. The next prime is 21210222020107. The reversal of 21210222020101 is 10102022201212.

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., 18870466320225 + 2339755699876 = 4344015^2 + 1529626^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210222020101 - 2⁹ = 21210222019589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210222020107) 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, 10605111010050 + 10605111010051.

It is an arithmetic number, because the mean of its divisors is an integer number (10605111010051).

Almost surely, 2^{21210222020101} is an apocalyptic number.

It is an amenable number.

21210222020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210222020101 is an equidigital number, since it uses as much as digits as its factorization.

21210222020101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210222020101 its reverse (10102022201212), we get a palindrome (31312244221313).

The spelling of 21210222020101 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, twenty thousand, one hundred one".