21120202011121 has 2 divisors, whose sum is σ = 21120202011122. Its totient is φ = 21120202011120.

The previous prime is 21120202011071. The next prime is 21120202011131. The reversal of 21120202011121 is 12111020202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20901492394225 + 218709616896 = 4571815^2 + 467664^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120202011121 - 2⁷ = 21120202010993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120202011095 and 21120202011104.

It is not a weakly prime, because it can be changed into another prime (21120202011131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560101005560 + 10560101005561.

It is an arithmetic number, because the mean of its divisors is an integer number (10560101005561).

Almost surely, 2^{21120202011121} is an apocalyptic number.

It is an amenable number.

21120202011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120202011121 is an equidigital number, since it uses as much as digits as its factorization.

21120202011121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120202011121 its reverse (12111020202112), we get a palindrome (33231222213233).

The spelling of 21120202011121 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, eleven thousand, one hundred twenty-one".