200121102111121 has 2 divisors, whose sum is σ = 200121102111122. Its totient is φ = 200121102111120.

The previous prime is 200121102111113. The next prime is 200121102111127. The reversal of 200121102111121 is 121111201121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198644782339600 + 1476319771521 = 14094140^2 + 1215039^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121102111121 - 2³ = 200121102111113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200121102111095 and 200121102111104.

It is not a weakly prime, because it can be changed into another prime (200121102111127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060551055560 + 100060551055561.

It is an arithmetic number, because the mean of its divisors is an integer number (100060551055561).

Almost surely, 2^{200121102111121} is an apocalyptic number.

It is an amenable number.

200121102111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121102111121 is an equidigital number, since it uses as much as digits as its factorization.

200121102111121 is an evil number, because the sum of its binary digits is even.

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

Adding to 200121102111121 its reverse (121111201121002), we get a palindrome (321232303232123).

The spelling of 200121102111121 in words is "two hundred trillion, one hundred twenty-one billion, one hundred two million, one hundred eleven thousand, one hundred twenty-one".