1019221961209 has 2 divisors, whose sum is σ = 1019221961210. Its totient is φ = 1019221961208.

The previous prime is 1019221961141. The next prime is 1019221961239. The reversal of 1019221961209 is 9021691229101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707612392809 + 311609568400 = 841197^2 + 558220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019221961209 - 2¹³ = 1019221953017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1019221961239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509610980604 + 509610980605.

It is an arithmetic number, because the mean of its divisors is an integer number (509610980605).

Almost surely, 2^{1019221961209} is an apocalyptic number.

It is an amenable number.

1019221961209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019221961209 is an equidigital number, since it uses as much as digits as its factorization.

1019221961209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The spelling of 1019221961209 in words is "one trillion, nineteen billion, two hundred twenty-one million, nine hundred sixty-one thousand, two hundred nine".