111421291 has 4 divisors (see below), whose sum is σ = 112298752. Its totient is φ = 110543832.

The previous prime is 111421267. The next prime is 111421351. The reversal of 111421291 is 192124111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111421291 - 2⁵ = 111421259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111421091) 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, 438540 + ... + 438793.

It is an arithmetic number, because the mean of its divisors is an integer number (28074688).

Almost surely, 2^111421291 is an apocalyptic number.

111421291 is a deficient number, since it is larger than the sum of its proper divisors (877461).

111421291 is an equidigital number, since it uses as much as digits as its factorization.

111421291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877460.

The product of its digits is 144, while the sum is 22.

The square root of 111421291 is about 10555.6284038422. The cubic root of 111421291 is about 481.1967979418.

The spelling of 111421291 in words is "one hundred eleven million, four hundred twenty-one thousand, two hundred ninety-one".