1211003133121 has 4 divisors (see below), whose sum is σ = 1211026393044. Its totient is φ = 1210979873200.

The previous prime is 1211003133079. The next prime is 1211003133127. The reversal of 1211003133121 is 1213313001121.

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 709909038721 + 501094094400 = 842561^2 + 707880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211003133121 - 2¹⁹ = 1211002608833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211003133127) 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, 11551690 + ... + 11656051.

It is an arithmetic number, because the mean of its divisors is an integer number (302756598261).

Almost surely, 2^{1211003133121} is an apocalyptic number.

It is an amenable number.

1211003133121 is a deficient number, since it is larger than the sum of its proper divisors (23259923).

1211003133121 is an equidigital number, since it uses as much as digits as its factorization.

1211003133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23259922.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1211003133121 its reverse (1213313001121), we get a palindrome (2424316134242).

The spelling of 1211003133121 in words is "one trillion, two hundred eleven billion, three million, one hundred thirty-three thousand, one hundred twenty-one".