1200211011 has 6 divisors (see below), whose sum is σ = 1733638140. Its totient is φ = 800140668.

The previous prime is 1200211007. The next prime is 1200211021. The reversal of 1200211011 is 1101120021.

It is a happy number.

It is not a de Polignac number, because 1200211011 - 2² = 1200211007 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: 133356779 = 1200211011 / (1 + 2 + 0 + 0 + 2 + 1 + 1 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1200210984 and 1200211002.

It is not an unprimeable number, because it can be changed into a prime (1200211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66678381 + ... + 66678398.

It is an arithmetic number, because the mean of its divisors is an integer number (288939690).

Almost surely, 2^1200211011 is an apocalyptic number.

1200211011 is a deficient number, since it is larger than the sum of its proper divisors (533427129).

1200211011 is a wasteful number, since it uses less digits than its factorization.

1200211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133356785 (or 133356782 counting only the distinct ones).

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

The square root of 1200211011 is about 34644.0616989406. The cubic root of 1200211011 is about 1062.7208523786.

Adding to 1200211011 its reverse (1101120021), we get a palindrome (2301331032).

The spelling of 1200211011 in words is "one billion, two hundred million, two hundred eleven thousand, eleven".