20211100221111 has 4 divisors (see below), whose sum is σ = 26948133628152. Its totient is φ = 13474066814072.

The previous prime is 20211100221071. The next prime is 20211100221131. The reversal of 20211100221111 is 11112200111202.

It is a happy number.

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 20211100221111 - 2⁶ = 20211100221047 is a prime.

It is a super-4 number, since 4×20211100221111⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211100221131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368516703516 + ... + 3368516703521.

It is an arithmetic number, because the mean of its divisors is an integer number (6737033407038).

Almost surely, 2^{20211100221111} is an apocalyptic number.

20211100221111 is a deficient number, since it is larger than the sum of its proper divisors (6737033407041).

20211100221111 is an equidigital number, since it uses as much as digits as its factorization.

20211100221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737033407040.

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

Adding to 20211100221111 its reverse (11112200111202), we get a palindrome (31323300332313).

The spelling of 20211100221111 in words is "twenty trillion, two hundred eleven billion, one hundred million, two hundred twenty-one thousand, one hundred eleven".