1011121212109 has 2 divisors, whose sum is σ = 1011121212110. Its totient is φ = 1011121212108.

The previous prime is 1011121212089. The next prime is 1011121212133. The reversal of 1011121212109 is 9012121211101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956722646884 + 54398565225 = 978122^2 + 233235^2 .

It is an emirp because it is prime and its reverse (9012121211101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011121212109 is a prime.

It is a super-2 number, since 2×1011121212109² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1011121212109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011121212209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505560606054 + 505560606055.

It is an arithmetic number, because the mean of its divisors is an integer number (505560606055).

Almost surely, 2^{1011121212109} is an apocalyptic number.

It is an amenable number.

1011121212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011121212109 is an equidigital number, since it uses as much as digits as its factorization.

1011121212109 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 22.

The spelling of 1011121212109 in words is "one trillion, eleven billion, one hundred twenty-one million, two hundred twelve thousand, one hundred nine".