111978421 has 8 divisors (see below), whose sum is σ = 119697984. Its totient is φ = 104496480.

The previous prime is 111978413. The next prime is 111978443. The reversal of 111978421 is 124879111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111978421 - 2³ = 111978413 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 (111978121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58431 + ... + 60316.

It is an arithmetic number, because the mean of its divisors is an integer number (14962248).

Almost surely, 2^111978421 is an apocalyptic number.

It is an amenable number.

111978421 is a deficient number, since it is larger than the sum of its proper divisors (7719563).

111978421 is a wasteful number, since it uses less digits than its factorization.

111978421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118811.

The product of its digits is 4032, while the sum is 34.

The square root of 111978421 is about 10581.9856832260. The cubic root of 111978421 is about 481.9974934300.

The spelling of 111978421 in words is "one hundred eleven million, nine hundred seventy-eight thousand, four hundred twenty-one".