21010122202111 has 4 divisors (see below), whose sum is σ = 24011568230992. Its totient is φ = 18008676173232.

The previous prime is 21010122202109. The next prime is 21010122202229. The reversal of 21010122202111 is 11120222101012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010122202111 - 2¹ = 21010122202109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010122202711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500723014430 + ... + 1500723014443.

It is an arithmetic number, because the mean of its divisors is an integer number (6002892057748).

Almost surely, 2^{21010122202111} is an apocalyptic number.

21010122202111 is a deficient number, since it is larger than the sum of its proper divisors (3001446028881).

21010122202111 is an equidigital number, since it uses as much as digits as its factorization.

21010122202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001446028880.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21010122202111 its reverse (11120222101012), we get a palindrome (32130344303123).

The spelling of 21010122202111 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, two hundred two thousand, one hundred eleven".