1012200111 has 32 divisors (see below), whose sum is σ = 1709910720. Its totient is φ = 586248192.

The previous prime is 1012200109. The next prime is 1012200113. The reversal of 1012200111 is 1110022101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1012200109) and next prime (1012200113).

It is not a de Polignac number, because 1012200111 - 2¹ = 1012200109 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 = 1012200093 and 1012200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012200113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78850 + ... + 90783.

It is an arithmetic number, because the mean of its divisors is an integer number (53434710).

Almost surely, 2^1012200111 is an apocalyptic number.

1012200111 is a deficient number, since it is larger than the sum of its proper divisors (697710609).

1012200111 is a wasteful number, since it uses less digits than its factorization.

1012200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169672 (or 169666 counting only the distinct ones).

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

The square root of 1012200111 is about 31815.0925034016. The cubic root of 1012200111 is about 1004.0502767768.

Adding to 1012200111 its reverse (1110022101), we get a palindrome (2122222212).

The spelling of 1012200111 in words is "one billion, twelve million, two hundred thousand, one hundred eleven".