20102121210121 has 2 divisors, whose sum is σ = 20102121210122. Its totient is φ = 20102121210120.

The previous prime is 20102121210107. The next prime is 20102121210251. The reversal of 20102121210121 is 12101212120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17946110601225 + 2156010608896 = 4236285^2 + 1468336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102121210121 - 2³⁹ = 19552365396233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20102121210095 and 20102121210104.

It is not a weakly prime, because it can be changed into another prime (20102121211121) 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, 10051060605060 + 10051060605061.

It is an arithmetic number, because the mean of its divisors is an integer number (10051060605061).

Almost surely, 2^{20102121210121} is an apocalyptic number.

It is an amenable number.

20102121210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102121210121 is an equidigital number, since it uses as much as digits as its factorization.

20102121210121 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 16.

Adding to 20102121210121 its reverse (12101212120102), we get a palindrome (32203333330223).

The spelling of 20102121210121 in words is "twenty trillion, one hundred two billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".