111612421 has 4 divisors (see below), whose sum is σ = 112057344. Its totient is φ = 111167500.

The previous prime is 111612379. The next prime is 111612427. The reversal of 111612421 is 124216111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124216111 = 353 ⋅351887.

It is a cyclic number.

It is not a de Polignac number, because 111612421 - 2²⁵ = 78057989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111612427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222085 + ... + 222586.

It is an arithmetic number, because the mean of its divisors is an integer number (28014336).

Almost surely, 2^111612421 is an apocalyptic number.

It is an amenable number.

111612421 is a deficient number, since it is larger than the sum of its proper divisors (444923).

111612421 is an equidigital number, since it uses as much as digits as its factorization.

111612421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444922.

The product of its digits is 96, while the sum is 19.

The square root of 111612421 is about 10564.6779884670. The cubic root of 111612421 is about 481.4717860962.

Adding to 111612421 its reverse (124216111), we get a palindrome (235828532).

The spelling of 111612421 in words is "one hundred eleven million, six hundred twelve thousand, four hundred twenty-one".