1211201121 has 16 divisors (see below), whose sum is σ = 1740662336. Its totient is φ = 744710976.

The previous prime is 1211201107. The next prime is 1211201207. The reversal of 1211201121 is 1211021121.

It is not a de Polignac number, because 1211201121 - 2⁷ = 1211200993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211201097 and 1211201106.

It is not an unprimeable number, because it can be changed into a prime (1211200121) 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 15 ways as a sum of consecutive naturals, for example, 34506 + ... + 60108.

It is an arithmetic number, because the mean of its divisors is an integer number (108791396).

Almost surely, 2^1211201121 is an apocalyptic number.

It is an amenable number.

1211201121 is a deficient number, since it is larger than the sum of its proper divisors (529461215).

1211201121 is a wasteful number, since it uses less digits than its factorization.

1211201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26832.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211201121 is about 34802.3148799042. The cubic root of 1211201121 is about 1065.9547144386.

Adding to 1211201121 its reverse (1211021121), we get a palindrome (2422222242).

The spelling of 1211201121 in words is "one billion, two hundred eleven million, two hundred one thousand, one hundred twenty-one".