1012112211809 has 2 divisors, whose sum is σ = 1012112211810. Its totient is φ = 1012112211808.

The previous prime is 1012112211793. The next prime is 1012112211821. The reversal of 1012112211809 is 9081122112101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 933542440000 + 78569771809 = 966200^2 + 280303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012112211809 - 2⁴ = 1012112211793 is a prime.

It is a super-2 number, since 2×1012112211809² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1012112211829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506056105904 + 506056105905.

It is an arithmetic number, because the mean of its divisors is an integer number (506056105905).

Almost surely, 2^{1012112211809} is an apocalyptic number.

It is an amenable number.

1012112211809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012112211809 is an equidigital number, since it uses as much as digits as its factorization.

1012112211809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 1012112211809 in words is "one trillion, twelve billion, one hundred twelve million, two hundred eleven thousand, eight hundred nine".