1200211101 has 20 divisors (see below), whose sum is σ = 1898375292. Its totient is φ = 753072768.

The previous prime is 1200211079. The next prime is 1200211183. The reversal of 1200211101 is 1011120021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 511935876 + 688275225 = 22626^2 + 26235^2 .

It is not a de Polignac number, because 1200211101 - 2⁶ = 1200211037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200211301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 434430 + ... + 437183.

Almost surely, 2^1200211101 is an apocalyptic number.

It is an amenable number.

1200211101 is a deficient number, since it is larger than the sum of its proper divisors (698164191).

1200211101 is an equidigital number, since it uses as much as digits as its factorization.

1200211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871642 (or 871633 counting only the distinct ones).

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

The square root of 1200211101 is about 34644.0629978644. The cubic root of 1200211101 is about 1062.7208789419.

Adding to 1200211101 its reverse (1011120021), we get a palindrome (2211331122).

The spelling of 1200211101 in words is "one billion, two hundred million, two hundred eleven thousand, one hundred one".