111552421 has 4 divisors (see below), whose sum is σ = 113443200. Its totient is φ = 109661644.

The previous prime is 111552409. The next prime is 111552433. The reversal of 111552421 is 124255111.

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: 124255111 = 29 ⋅4284659.

It is an interprime number because it is at equal distance from previous prime (111552409) and next prime (111552433).

It is a cyclic number.

It is not a de Polignac number, because 111552421 - 2⁷ = 111552293 is a prime.

It is a super-2 number, since 2×111552421² = 24887885261922482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111552392 and 111552401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111552451) 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, 945301 + ... + 945418.

It is an arithmetic number, because the mean of its divisors is an integer number (28360800).

Almost surely, 2^111552421 is an apocalyptic number.

It is an amenable number.

111552421 is a deficient number, since it is larger than the sum of its proper divisors (1890779).

111552421 is an equidigital number, since it uses as much as digits as its factorization.

111552421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890778.

The product of its digits is 400, while the sum is 22.

The square root of 111552421 is about 10561.8379555833. The cubic root of 111552421 is about 481.3854949678.

The spelling of 111552421 in words is "one hundred eleven million, five hundred fifty-two thousand, four hundred twenty-one".