20111021202211 has 4 divisors (see below), whose sum is σ = 20111381754552. Its totient is φ = 20110660649872.

The previous prime is 20111021202131. The next prime is 20111021202221. The reversal of 20111021202211 is 11220212011102.

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 20111021202211 - 2¹¹ = 20111021200163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111021202221) 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, 180192490 + ... + 180304063.

It is an arithmetic number, because the mean of its divisors is an integer number (5027845438638).

Almost surely, 2^{20111021202211} is an apocalyptic number.

20111021202211 is a deficient number, since it is larger than the sum of its proper divisors (360552341).

20111021202211 is an equidigital number, since it uses as much as digits as its factorization.

20111021202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360552340.

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

Adding to 20111021202211 its reverse (11220212011102), we get a palindrome (31331233213313).

The spelling of 20111021202211 in words is "twenty trillion, one hundred eleven billion, twenty-one million, two hundred two thousand, two hundred eleven".