111507421 has 2 divisors, whose sum is σ = 111507422. Its totient is φ = 111507420.

The previous prime is 111507419. The next prime is 111507449. The reversal of 111507421 is 124705111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106605625 + 4901796 = 10325^2 + 2214^2 .

It is an emirp because it is prime and its reverse (124705111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111507421 - 2¹ = 111507419 is a prime.

Together with 111507419, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111507392 and 111507401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111507481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55753710 + 55753711.

It is an arithmetic number, because the mean of its divisors is an integer number (55753711).

Almost surely, 2^111507421 is an apocalyptic number.

It is an amenable number.

111507421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111507421 is an equidigital number, since it uses as much as digits as its factorization.

111507421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 111507421 is about 10559.7074296592. The cubic root of 111507421 is about 481.3207563137.

The spelling of 111507421 in words is "one hundred eleven million, five hundred seven thousand, four hundred twenty-one".