20111110210221 has 16 divisors (see below), whose sum is σ = 27517487230464. Its totient is φ = 13057867119024.

The previous prime is 20111110210187. The next prime is 20111110210249. The reversal of 20111110210221 is 12201201111102.

It is a happy number.

It is not a de Polignac number, because 20111110210221 - 2¹⁵ = 20111110177453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111110210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111110230221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224595121 + ... + 224684646.

It is an arithmetic number, because the mean of its divisors is an integer number (1719842951904).

Almost surely, 2^{20111110210221} is an apocalyptic number.

It is an amenable number.

20111110210221 is a deficient number, since it is larger than the sum of its proper divisors (7406377020243).

20111110210221 is a wasteful number, since it uses less digits than its factorization.

20111110210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449280160.

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

Adding to 20111110210221 its reverse (12201201111102), we get a palindrome (32312311321323).

The spelling of 20111110210221 in words is "twenty trillion, one hundred eleven billion, one hundred ten million, two hundred ten thousand, two hundred twenty-one".