1211200126 has 4 divisors (see below), whose sum is σ = 1816800192. Its totient is φ = 605600062.

The previous prime is 1211200121. The next prime is 1211200141. The reversal of 1211200126 is 6210021121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6210021121 = 47681 ⋅130241.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302800030 + ... + 302800033.

It is an arithmetic number, because the mean of its divisors is an integer number (454200048).

Almost surely, 2^1211200126 is an apocalyptic number.

1211200126 is a deficient number, since it is larger than the sum of its proper divisors (605600066).

1211200126 is an equidigital number, since it uses as much as digits as its factorization.

1211200126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605600065.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211200126 is about 34802.3005848751. The cubic root of 1211200126 is about 1065.9544225451.

Adding to 1211200126 its reverse (6210021121), we get a palindrome (7421221247).

The spelling of 1211200126 in words is "one billion, two hundred eleven million, two hundred thousand, one hundred twenty-six".