1202021209 has 2 divisors, whose sum is σ = 1202021210. Its totient is φ = 1202021208.

The previous prime is 1202021207. The next prime is 1202021237. The reversal of 1202021209 is 9021202021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1093757184 + 108264025 = 33072^2 + 10405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202021209 - 2¹ = 1202021207 is a prime.

Together with 1202021207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1202021207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601010604 + 601010605.

It is an arithmetic number, because the mean of its divisors is an integer number (601010605).

Almost surely, 2^1202021209 is an apocalyptic number.

It is an amenable number.

1202021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202021209 is an equidigital number, since it uses as much as digits as its factorization.

1202021209 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 square root of 1202021209 is about 34670.1775161305. The cubic root of 1202021209 is about 1063.2548609283.

The spelling of 1202021209 in words is "one billion, two hundred two million, twenty-one thousand, two hundred nine".