2101220121111 has 16 divisors (see below), whose sum is σ = 2877436345344. Its totient is φ = 1362911020704.

The previous prime is 2101220121107. The next prime is 2101220121137. The reversal of 2101220121111 is 1111210221012.

It is a happy number.

It is not a de Polignac number, because 2101220121111 - 2² = 2101220121107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220121151) 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, 3491686 + ... + 4048988.

It is an arithmetic number, because the mean of its divisors is an integer number (179839771584).

Almost surely, 2^{2101220121111} is an apocalyptic number.

2101220121111 is a deficient number, since it is larger than the sum of its proper divisors (776216224233).

2101220121111 is a wasteful number, since it uses less digits than its factorization.

2101220121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591310.

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

Adding to 2101220121111 its reverse (1111210221012), we get a palindrome (3212430342123).

Subtracting from 2101220121111 its reverse (1111210221012), we obtain a palindrome (990009900099).

The spelling of 2101220121111 in words is "two trillion, one hundred one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred eleven".