1121210012009 has 2 divisors, whose sum is σ = 1121210012010. Its totient is φ = 1121210012008.

The previous prime is 1121210011973. The next prime is 1121210012029. The reversal of 1121210012009 is 9002100121211.

It is an a-pointer prime, because the next prime (1121210012029) can be obtained adding 1121210012009 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611128372009 + 510081640000 = 781747^2 + 714200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121210012009 - 2³⁶ = 1052490535273 is a prime.

It is a super-2 number, since 2×1121210012009² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121210012029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560605006004 + 560605006005.

It is an arithmetic number, because the mean of its divisors is an integer number (560605006005).

Almost surely, 2^{1121210012009} is an apocalyptic number.

It is an amenable number.

1121210012009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121210012009 is an equidigital number, since it uses as much as digits as its factorization.

1121210012009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1121210012009 in words is "one trillion, one hundred twenty-one billion, two hundred ten million, twelve thousand, nine".