111221511837907 has 2 divisors, whose sum is σ = 111221511837908. Its totient is φ = 111221511837906.

The previous prime is 111221511837881. The next prime is 111221511837929. The reversal of 111221511837907 is 709738115122111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221511837907 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221511837967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610755918953 + 55610755918954.

It is an arithmetic number, because the mean of its divisors is an integer number (55610755918954).

Almost surely, 2^{111221511837907} is an apocalyptic number.

111221511837907 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221511837907 is an equidigital number, since it uses as much as digits as its factorization.

111221511837907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 49.

The spelling of 111221511837907 in words is "one hundred eleven trillion, two hundred twenty-one billion, five hundred eleven million, eight hundred thirty-seven thousand, nine hundred seven".