1012002111 has 24 divisors (see below), whose sum is σ = 1544265840. Its totient is φ = 636854400.

The previous prime is 1012002109. The next prime is 1012002113. The reversal of 1012002111 is 1112002101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1012002109) and next prime (1012002113).

It is not a de Polignac number, because 1012002111 - 2¹ = 1012002109 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 = 1012002093 and 1012002102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012002113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37521 + ... + 58581.

It is an arithmetic number, because the mean of its divisors is an integer number (64344410).

Almost surely, 2^1012002111 is an apocalyptic number.

1012002111 is a deficient number, since it is larger than the sum of its proper divisors (532263729).

1012002111 is a wasteful number, since it uses less digits than its factorization.

1012002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21367 (or 21364 counting only the distinct ones).

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

The square root of 1012002111 is about 31811.9806205147. The cubic root of 1012002111 is about 1003.9848039133.

Adding to 1012002111 its reverse (1112002101), we get a palindrome (2124004212).

The spelling of 1012002111 in words is "one billion, twelve million, two thousand, one hundred eleven".