1211121120233 has 4 divisors (see below), whose sum is σ = 1211124786900. Its totient is φ = 1211117453568.

The previous prime is 1211121120191. The next prime is 1211121120269. The reversal of 1211121120233 is 3320211211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 994064832784 + 217056287449 = 997028^2 + 465893^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211121120233 - 2¹⁶ = 1211121054697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211121150233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282760 + ... + 2016857.

It is an arithmetic number, because the mean of its divisors is an integer number (302781196725).

Almost surely, 2^{1211121120233} is an apocalyptic number.

It is an amenable number.

1211121120233 is a deficient number, since it is larger than the sum of its proper divisors (3666667).

1211121120233 is an equidigital number, since it uses as much as digits as its factorization.

1211121120233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666666.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211121120233 its reverse (3320211211121), we get a palindrome (4531332331354).

The spelling of 1211121120233 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty thousand, two hundred thirty-three".