211220021101111 has 4 divisors (see below), whose sum is σ = 230421841201224. Its totient is φ = 192018201001000.

The previous prime is 211220021101109. The next prime is 211220021101127. The reversal of 211220021101111 is 111101120022112.

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

It is not a de Polignac number, because 211220021101111 - 2¹ = 211220021101109 is a prime.

It is a super-2 number, since 2×211220021101111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220021101151) 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 3 ways as a sum of consecutive naturals, for example, 9600910050040 + ... + 9600910050061.

It is an arithmetic number, because the mean of its divisors is an integer number (57605460300306).

Almost surely, 2^{211220021101111} is an apocalyptic number.

211220021101111 is a deficient number, since it is larger than the sum of its proper divisors (19201820100113).

211220021101111 is a wasteful number, since it uses less digits than its factorization.

211220021101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19201820100112.

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

Adding to 211220021101111 its reverse (111101120022112), we get a palindrome (322321141123223).

The spelling of 211220021101111 in words is "two hundred eleven trillion, two hundred twenty billion, twenty-one million, one hundred one thousand, one hundred eleven".