1002120111 has 12 divisors (see below), whose sum is σ = 1450680192. Its totient is φ = 666615456.

The previous prime is 1002120109. The next prime is 1002120121. The reversal of 1002120111 is 1110212001.

It is a happy number.

It is not a de Polignac number, because 1002120111 - 2¹ = 1002120109 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 = 1002120093 and 1002120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002120101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117711 + ... + 125936.

It is an arithmetic number, because the mean of its divisors is an integer number (120890016).

Almost surely, 2^1002120111 is an apocalyptic number.

1002120111 is a deficient number, since it is larger than the sum of its proper divisors (448560081).

1002120111 is a wasteful number, since it uses less digits than its factorization.

1002120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244110 (or 244107 counting only the distinct ones).

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

The square root of 1002120111 is about 31656.2807512190. The cubic root of 1002120111 is about 1000.7062048240.

Adding to 1002120111 its reverse (1110212001), we get a palindrome (2112332112).

The spelling of 1002120111 in words is "one billion, two million, one hundred twenty thousand, one hundred eleven".