121002111 has 24 divisors (see below), whose sum is σ = 182879424. Its totient is φ = 77015040.

The previous prime is 121002109. The next prime is 121002113. The reversal of 121002111 is 111200121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121002109) and next prime (121002113).

It is not a de Polignac number, because 121002111 - 2¹ = 121002109 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 121002093 and 121002102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002113) 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 23 ways as a sum of consecutive naturals, for example, 13855 + ... + 20831.

It is an arithmetic number, because the mean of its divisors is an integer number (7619976).

Almost surely, 2^121002111 is an apocalyptic number.

121002111 is a deficient number, since it is larger than the sum of its proper divisors (61877313).

121002111 is a wasteful number, since it uses less digits than its factorization.

121002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071 (or 7068 counting only the distinct ones).

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

The square root of 121002111 is about 11000.0959541269. The cubic root of 121002111 is about 494.6116206692.

Adding to 121002111 its reverse (111200121), we get a palindrome (232202232).

The spelling of 121002111 in words is "one hundred twenty-one million, two thousand, one hundred eleven".