21202010101121 has 2 divisors, whose sum is σ = 21202010101122. Its totient is φ = 21202010101120.

The previous prime is 21202010101099. The next prime is 21202010101123. The reversal of 21202010101121 is 12110101020212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12070517290225 + 9131492810896 = 3474265^2 + 3021836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202010101121 is a prime.

Together with 21202010101123, 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 = 21202010101096 and 21202010101105.

It is not a weakly prime, because it can be changed into another prime (21202010101123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601005050560 + 10601005050561.

It is an arithmetic number, because the mean of its divisors is an integer number (10601005050561).

Almost surely, 2^{21202010101121} is an apocalyptic number.

It is an amenable number.

21202010101121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202010101121 is an equidigital number, since it uses as much as digits as its factorization.

21202010101121 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 14.

Adding to 21202010101121 its reverse (12110101020212), we get a palindrome (33312111121333).

The spelling of 21202010101121 in words is "twenty-one trillion, two hundred two billion, ten million, one hundred one thousand, one hundred twenty-one".