1001211221211 has 16 divisors (see below), whose sum is σ = 1346568673824. Its totient is φ = 661688423424.

The previous prime is 1001211221209. The next prime is 1001211221261. The reversal of 1001211221211 is 1121221121001.

It is a happy number.

It is not a de Polignac number, because 1001211221211 - 2¹ = 1001211221209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001211221261) 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 15 ways as a sum of consecutive naturals, for example, 2894230 + ... + 3221643.

It is an arithmetic number, because the mean of its divisors is an integer number (84160542114).

Almost surely, 2^{1001211221211} is an apocalyptic number.

1001211221211 is a deficient number, since it is larger than the sum of its proper divisors (345357452613).

1001211221211 is a wasteful number, since it uses less digits than its factorization.

1001211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116350.

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

Adding to 1001211221211 its reverse (1121221121001), we get a palindrome (2122432342212).

The spelling of 1001211221211 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".