1209120921311 has 2 divisors, whose sum is σ = 1209120921312. Its totient is φ = 1209120921310.

The previous prime is 1209120921233. The next prime is 1209120921319. The reversal of 1209120921311 is 1131290219021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209120921311 - 2³⁰ = 1208047179487 is a prime.

It is a super-2 number, since 2×1209120921311² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209120921319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604560460655 + 604560460656.

It is an arithmetic number, because the mean of its divisors is an integer number (604560460656).

Almost surely, 2^{1209120921311} is an apocalyptic number.

1209120921311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209120921311 is an equidigital number, since it uses as much as digits as its factorization.

1209120921311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 1209120921311 in words is "one trillion, two hundred nine billion, one hundred twenty million, nine hundred twenty-one thousand, three hundred eleven".