1012120011 has 24 divisors (see below), whose sum is σ = 1690940160. Its totient is φ = 571383216.

The previous prime is 1012120003. The next prime is 1012120027. The reversal of 1012120011 is 1100212101.

It is a happy number.

It is not a de Polignac number, because 1012120011 - 2³ = 1012120003 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 = 1012119975 and 1012120002.

It is not an unprimeable number, because it can be changed into a prime (1012120061) 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, 91551 + ... + 102008.

It is an arithmetic number, because the mean of its divisors is an integer number (70455840).

Almost surely, 2^1012120011 is an apocalyptic number.

1012120011 is a deficient number, since it is larger than the sum of its proper divisors (678820149).

1012120011 is a wasteful number, since it uses less digits than its factorization.

1012120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193655 (or 193652 counting only the distinct ones).

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

The square root of 1012120011 is about 31813.8336419866. The cubic root of 1012120011 is about 1004.0237910559.

Adding to 1012120011 its reverse (1100212101), we get a palindrome (2112332112).

The spelling of 1012120011 in words is "one billion, twelve million, one hundred twenty thousand, eleven".