1211203020409 has 2 divisors, whose sum is σ = 1211203020410. Its totient is φ = 1211203020408.

The previous prime is 1211203020371. The next prime is 1211203020421. The reversal of 1211203020409 is 9040203021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1098572304384 + 112630716025 = 1048128^2 + 335605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211203020409 - 2³¹ = 1209055536761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211203021409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605601510204 + 605601510205.

It is an arithmetic number, because the mean of its divisors is an integer number (605601510205).

Almost surely, 2^{1211203020409} is an apocalyptic number.

It is an amenable number.

1211203020409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211203020409 is an equidigital number, since it uses as much as digits as its factorization.

1211203020409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 1211203020409 in words is "one trillion, two hundred eleven billion, two hundred three million, twenty thousand, four hundred nine".