1200021022009 has 2 divisors, whose sum is σ = 1200021022010. Its totient is φ = 1200021022008.

The previous prime is 1200021021971. The next prime is 1200021022051. The reversal of 1200021022009 is 9002201200021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058666077225 + 141354944784 = 1028915^2 + 375972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200021022009 - 2³¹ = 1197873538361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200021022609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010511004 + 600010511005.

It is an arithmetic number, because the mean of its divisors is an integer number (600010511005).

Almost surely, 2^{1200021022009} is an apocalyptic number.

It is an amenable number.

1200021022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021022009 is an equidigital number, since it uses as much as digits as its factorization.

1200021022009 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 19.

The spelling of 1200021022009 in words is "one trillion, two hundred billion, twenty-one million, twenty-two thousand, nine".