1001220101211 has 16 divisors (see below), whose sum is σ = 1468355856768. Its totient is φ = 606800058920.

The previous prime is 1001220101201. The next prime is 1001220101237. The reversal of 1001220101211 is 1121010221001.

It is not a de Polignac number, because 1001220101211 - 2⁵ = 1001220101179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001220101201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125367921 + ... + 125375906.

It is an arithmetic number, because the mean of its divisors is an integer number (91772241048).

Almost surely, 2^{1001220101211} is an apocalyptic number.

1001220101211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1001220101211 is a deficient number, since it is larger than the sum of its proper divisors (467135755557).

1001220101211 is an equidigital number, since it uses as much as digits as its factorization.

1001220101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250743863 (or 250743841 counting only the distinct ones).

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

Adding to 1001220101211 its reverse (1121010221001), we get a palindrome (2122230322212).

The spelling of 1001220101211 in words is "one trillion, one billion, two hundred twenty million, one hundred one thousand, two hundred eleven".