111243021 has 16 divisors (see below), whose sum is σ = 153865536. Its totient is φ = 71438976.

The previous prime is 111243007. The next prime is 111243029. The reversal of 111243021 is 120342111.

It is not a de Polignac number, because 111243021 - 2¹¹ = 111240973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111243029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3511 + ... + 15323.

It is an arithmetic number, because the mean of its divisors is an integer number (9616596).

Almost surely, 2^111243021 is an apocalyptic number.

It is an amenable number.

111243021 is a deficient number, since it is larger than the sum of its proper divisors (42622515).

111243021 is a wasteful number, since it uses less digits than its factorization.

111243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11932.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 111243021 is about 10547.1807133471. The cubic root of 111243021 is about 480.9400285129.

Adding to 111243021 its reverse (120342111), we get a palindrome (231585132).

The spelling of 111243021 in words is "one hundred eleven million, two hundred forty-three thousand, twenty-one".