202012211212121 has 2 divisors, whose sum is σ = 202012211212122. Its totient is φ = 202012211212120.

The previous prime is 202012211212081. The next prime is 202012211212127. The reversal of 202012211212121 is 121212112210202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191366275590400 + 10645935621721 = 13833520^2 + 3262811^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012211212121 - 2³⁰ = 202011137470297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202012211212093 and 202012211212102.

It is not a weakly prime, because it can be changed into another prime (202012211212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006105606060 + 101006105606061.

It is an arithmetic number, because the mean of its divisors is an integer number (101006105606061).

Almost surely, 2^{202012211212121} is an apocalyptic number.

It is an amenable number.

202012211212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012211212121 is an equidigital number, since it uses as much as digits as its factorization.

202012211212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 202012211212121 its reverse (121212112210202), we get a palindrome (323224323422323).

The spelling of 202012211212121 in words is "two hundred two trillion, twelve billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".