200121111201281 has 2 divisors, whose sum is σ = 200121111201282. Its totient is φ = 200121111201280.

The previous prime is 200121111201247. The next prime is 200121111201287. The reversal of 200121111201281 is 182102111121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143875011133681 + 56246100067600 = 11994791^2 + 7499740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200121111201281 is a prime.

It is a super-2 number, since 2×200121111201281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (200121111201287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060555600640 + 100060555600641.

It is an arithmetic number, because the mean of its divisors is an integer number (100060555600641).

Almost surely, 2^{200121111201281} is an apocalyptic number.

It is an amenable number.

200121111201281 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121111201281 is an equidigital number, since it uses as much as digits as its factorization.

200121111201281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 200121111201281 its reverse (182102111121002), we get a palindrome (382223222322283).

The spelling of 200121111201281 in words is "two hundred trillion, one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred eighty-one".