111347977021 has 2 divisors, whose sum is σ = 111347977022. Its totient is φ = 111347977020.

The previous prime is 111347977019. The next prime is 111347977043. The reversal of 111347977021 is 120779743111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69440155225 + 41907821796 = 263515^2 + 204714^2 .

It is a cyclic number.

It is not a de Polignac number, because 111347977021 - 2¹ = 111347977019 is a prime.

Together with 111347977019, 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 (111347977061) 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, 55673988510 + 55673988511.

It is an arithmetic number, because the mean of its divisors is an integer number (55673988511).

Almost surely, 2^111347977021 is an apocalyptic number.

It is an amenable number.

111347977021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111347977021 is an equidigital number, since it uses as much as digits as its factorization.

111347977021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 43.

The spelling of 111347977021 in words is "one hundred eleven billion, three hundred forty-seven million, nine hundred seventy-seven thousand, twenty-one".