202120021121 has 2 divisors, whose sum is σ = 202120021122. Its totient is φ = 202120021120.

The previous prime is 202120021087. The next prime is 202120021139. The reversal of 202120021121 is 121120021202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131663751025 + 70456270096 = 362855^2 + 265436^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120021121 - 2⁶ = 202120021057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202120021096 and 202120021105.

It is not a weakly prime, because it can be changed into another prime (202120021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060010560 + 101060010561.

It is an arithmetic number, because the mean of its divisors is an integer number (101060010561).

Almost surely, 2^202120021121 is an apocalyptic number.

It is an amenable number.

202120021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120021121 is an equidigital number, since it uses as much as digits as its factorization.

202120021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202120021121 its reverse (121120021202), we get a palindrome (323240042323).

The spelling of 202120021121 in words is "two hundred two billion, one hundred twenty million, twenty-one thousand, one hundred twenty-one".