1210120011 has 6 divisors (see below), whose sum is σ = 1747951140. Its totient is φ = 806746668.

The previous prime is 1210120003. The next prime is 1210120049. The reversal of 1210120011 is 1100210121.

It is a happy number.

It is not a de Polignac number, because 1210120011 - 2³ = 1210120003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134457779 = 1210120011 / (1 + 2 + 1 + 0 + 1 + 2 + 0 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1210119975 and 1210120002.

It is not an unprimeable number, because it can be changed into a prime (1210120511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67228881 + ... + 67228898.

It is an arithmetic number, because the mean of its divisors is an integer number (291325190).

Almost surely, 2^1210120011 is an apocalyptic number.

1210120011 is a deficient number, since it is larger than the sum of its proper divisors (537831129).

1210120011 is a wasteful number, since it uses less digits than its factorization.

1210120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134457785 (or 134457782 counting only the distinct ones).

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

The square root of 1210120011 is about 34786.7792559185. The cubic root of 1210120011 is about 1065.6374653513.

Adding to 1210120011 its reverse (1100210121), we get a palindrome (2310330132).

The spelling of 1210120011 in words is "one billion, two hundred ten million, one hundred twenty thousand, eleven".