111211421 has 4 divisors (see below), whose sum is σ = 111919932. Its totient is φ = 110502912.

The previous prime is 111211411. The next prime is 111211439. The reversal of 111211421 is 124112111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124112111 = 157 ⋅790523.

It can be written as a sum of positive squares in 2 ways, for example, as 70392100 + 40819321 = 8390^2 + 6389^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211421 - 2¹⁰ = 111210397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211396 and 111211405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354020 + ... + 354333.

It is an arithmetic number, because the mean of its divisors is an integer number (27979983).

Almost surely, 2^111211421 is an apocalyptic number.

It is an amenable number.

111211421 is a deficient number, since it is larger than the sum of its proper divisors (708511).

111211421 is an equidigital number, since it uses as much as digits as its factorization.

111211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708510.

The product of its digits is 16, while the sum is 14.

The square root of 111211421 is about 10545.6825762963. The cubic root of 111211421 is about 480.8944851490.

Adding to 111211421 its reverse (124112111), we get a palindrome (235323532).

The spelling of 111211421 in words is "one hundred eleven million, two hundred eleven thousand, four hundred twenty-one".