2001111220101 has 16 divisors (see below), whose sum is σ = 3050092136448. Its totient is φ = 1143199700400.

The previous prime is 2001111220099. The next prime is 2001111220127. The reversal of 2001111220101 is 1010221111002.

It is not a de Polignac number, because 2001111220101 - 2¹ = 2001111220099 is a prime.

It is a super-2 number, since 2×2001111220101² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001111220181) 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, 12100305 + ... + 12264566.

It is an arithmetic number, because the mean of its divisors is an integer number (190630758528).

Almost surely, 2^{2001111220101} is an apocalyptic number.

2001111220101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2001111220101 is a deficient number, since it is larger than the sum of its proper divisors (1048980916347).

2001111220101 is a wasteful number, since it uses less digits than its factorization.

2001111220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24368792.

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

Adding to 2001111220101 its reverse (1010221111002), we get a palindrome (3011332331103).

The spelling of 2001111220101 in words is "two trillion, one billion, one hundred eleven million, two hundred twenty thousand, one hundred one".