1212000111 has 32 divisors (see below), whose sum is σ = 2141291520. Its totient is φ = 662457312.

The previous prime is 1212000071. The next prime is 1212000151. The reversal of 1212000111 is 1110002121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212000071) and next prime (1212000151).

It is not a de Polignac number, because 1212000111 - 2⁶ = 1212000047 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 = 1212000093 and 1212000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212000151) 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, 135060 + ... + 143753.

It is an arithmetic number, because the mean of its divisors is an integer number (66915360).

Almost surely, 2^1212000111 is an apocalyptic number.

1212000111 is a deficient number, since it is larger than the sum of its proper divisors (929291409).

1212000111 is a wasteful number, since it uses less digits than its factorization.

1212000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278852 (or 278846 counting only the distinct ones).

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

The square root of 1212000111 is about 34813.7919652542. The cubic root of 1212000111 is about 1066.1890548065.

Adding to 1212000111 its reverse (1110002121), we get a palindrome (2322002232).

The spelling of 1212000111 in words is "one billion, two hundred twelve million, one hundred eleven", and thus it is an aban number.