1001121212211 has 32 divisors (see below), whose sum is σ = 1362491961600. Its totient is φ = 653681508480.

The previous prime is 1001121212171. The next prime is 1001121212227. The reversal of 1001121212211 is 1122121211001.

It is a happy number.

It is not a de Polignac number, because 1001121212211 - 2¹⁴ = 1001121195827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001121212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41930385 + ... + 41954253.

It is an arithmetic number, because the mean of its divisors is an integer number (42577873800).

Almost surely, 2^{1001121212211} is an apocalyptic number.

1001121212211 is a deficient number, since it is larger than the sum of its proper divisors (361370749389).

1001121212211 is a wasteful number, since it uses less digits than its factorization.

1001121212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24899.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1001121212211 its reverse (1122121211001), we get a palindrome (2123242423212).

The spelling of 1001121212211 in words is "one trillion, one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".