200121022081 has 2 divisors, whose sum is σ = 200121022082. Its totient is φ = 200121022080.

The previous prime is 200121022061. The next prime is 200121022103. The reversal of 200121022081 is 180220121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190257354225 + 9863667856 = 436185^2 + 99316^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121022081 - 2³⁷ = 62682068609 is a prime.

It is a super-2 number, since 2×200121022081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (200121022021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060511040 + 100060511041.

It is an arithmetic number, because the mean of its divisors is an integer number (100060511041).

Almost surely, 2^200121022081 is an apocalyptic number.

It is an amenable number.

200121022081 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121022081 is an equidigital number, since it uses as much as digits as its factorization.

200121022081 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 19.

Adding to 200121022081 its reverse (180220121002), we get a palindrome (380341143083).

The spelling of 200121022081 in words is "two hundred billion, one hundred twenty-one million, twenty-two thousand, eighty-one".