111021212110909 has 2 divisors, whose sum is σ = 111021212110910. Its totient is φ = 111021212110908.

The previous prime is 111021212110829. The next prime is 111021212110951. The reversal of 111021212110909 is 909011212120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75393707532025 + 35627504578884 = 8682955^2 + 5968878^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021212110909 - 2¹⁷ = 111021211979837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021212110979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510606055454 + 55510606055455.

It is an arithmetic number, because the mean of its divisors is an integer number (55510606055455).

Almost surely, 2^{111021212110909} is an apocalyptic number.

It is an amenable number.

111021212110909 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021212110909 is an equidigital number, since it uses as much as digits as its factorization.

111021212110909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 111021212110909 in words is "one hundred eleven trillion, twenty-one billion, two hundred twelve million, one hundred ten thousand, nine hundred nine".