111021210109 has 2 divisors, whose sum is σ = 111021210110. Its totient is φ = 111021210108.

The previous prime is 111021210107. The next prime is 111021210133. The reversal of 111021210109 is 901012120111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73869804100 + 37151406009 = 271790^2 + 192747^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021210109 - 2¹ = 111021210107 is a prime.

Together with 111021210107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021210107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510605054 + 55510605055.

It is an arithmetic number, because the mean of its divisors is an integer number (55510605055).

Almost surely, 2^111021210109 is an apocalyptic number.

It is an amenable number.

111021210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021210109 is an equidigital number, since it uses as much as digits as its factorization.

111021210109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 111021210109 in words is "one hundred eleven billion, twenty-one million, two hundred ten thousand, one hundred nine".