200121123133021 has 2 divisors, whose sum is σ = 200121123133022. Its totient is φ = 200121123133020.

The previous prime is 200121123132967. The next prime is 200121123133039. The reversal of 200121123133021 is 120331321121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159545318765625 + 40575804367396 = 12631125^2 + 6369914^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121123133021 - 2⁹ = 200121123132509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200121123132983 and 200121123133001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121123133721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060561566510 + 100060561566511.

It is an arithmetic number, because the mean of its divisors is an integer number (100060561566511).

Almost surely, 2^{200121123133021} is an apocalyptic number.

It is an amenable number.

200121123133021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121123133021 is an equidigital number, since it uses as much as digits as its factorization.

200121123133021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 200121123133021 its reverse (120331321121002), we get a palindrome (320452444254023).

The spelling of 200121123133021 in words is "two hundred trillion, one hundred twenty-one billion, one hundred twenty-three million, one hundred thirty-three thousand, twenty-one".