21010111222111 has 8 divisors (see below), whose sum is σ = 22920155269200. Its totient is φ = 19100072831040.

The previous prime is 21010111222073. The next prime is 21010111222127. The reversal of 21010111222111 is 11122211101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010111222111 - 2³³ = 21001521287519 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 (21010111222151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11408835 + ... + 13121803.

It is an arithmetic number, because the mean of its divisors is an integer number (2865019408650).

Almost surely, 2^{21010111222111} is an apocalyptic number.

21010111222111 is a deficient number, since it is larger than the sum of its proper divisors (1910044047089).

21010111222111 is a wasteful number, since it uses less digits than its factorization.

21010111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828009.

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

Adding to 21010111222111 its reverse (11122211101012), we get a palindrome (32132322323123).

The spelling of 21010111222111 in words is "twenty-one trillion, ten billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".