111402421 has 4 divisors (see below), whose sum is σ = 119971852. Its totient is φ = 102832992.

The previous prime is 111402413. The next prime is 111402461. The reversal of 111402421 is 124204111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48024900 + 63377521 = 6930^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 111402421 - 2³ = 111402413 is a prime.

It is a super-2 number, since 2×111402421² = 24820998809322482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111402395 and 111402404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111402461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4284696 + ... + 4284721.

It is an arithmetic number, because the mean of its divisors is an integer number (29992963).

Almost surely, 2^111402421 is an apocalyptic number.

It is an amenable number.

111402421 is a deficient number, since it is larger than the sum of its proper divisors (8569431).

111402421 is an equidigital number, since it uses as much as digits as its factorization.

111402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8569430.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 111402421 is about 10554.7345300581. The cubic root of 111402421 is about 481.1696316909.

Adding to 111402421 its reverse (124204111), we get a palindrome (235606532).

The spelling of 111402421 in words is "one hundred eleven million, four hundred two thousand, four hundred twenty-one".