111002121 has 24 divisors (see below), whose sum is σ = 164155680. Its totient is φ = 72259776.

The previous prime is 111002107. The next prime is 111002137. The reversal of 111002121 is 121200111.

It is a happy number.

It is not a de Polignac number, because 111002121 - 2⁹ = 111001609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (111002321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69510 + ... + 71088.

It is an arithmetic number, because the mean of its divisors is an integer number (6839820).

Almost surely, 2^111002121 is an apocalyptic number.

It is an amenable number.

111002121 is a deficient number, since it is larger than the sum of its proper divisors (53153559).

111002121 is a wasteful number, since it uses less digits than its factorization.

111002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111002121 is about 10535.7544105773. The cubic root of 111002121 is about 480.5926144034.

Adding to 111002121 its reverse (121200111), we get a palindrome (232202232).

The spelling of 111002121 in words is "one hundred eleven million, two thousand, one hundred twenty-one".