200002121021009 has 2 divisors, whose sum is σ = 200002121021010. Its totient is φ = 200002121021008.

The previous prime is 200002121020957. The next prime is 200002121021039. The reversal of 200002121021009 is 900120121200002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141196182760000 + 58805938261009 = 11882600^2 + 7668503^2 .

It is a cyclic number.

It is not a de Polignac number, because 200002121021009 - 2¹² = 200002121016913 is a prime.

It is not a weakly prime, because it can be changed into another prime (200002121021039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100001060510504 + 100001060510505.

It is an arithmetic number, because the mean of its divisors is an integer number (100001060510505).

Almost surely, 2^{200002121021009} is an apocalyptic number.

It is an amenable number.

200002121021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

200002121021009 is an equidigital number, since it uses as much as digits as its factorization.

200002121021009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 200002121021009 in words is "two hundred trillion, two billion, one hundred twenty-one million, twenty-one thousand, nine".