20211111212011 has 12 divisors (see below), whose sum is σ = 21331725332400. Its totient is φ = 19146574137168.

The previous prime is 20211111212009. The next prime is 20211111212053. The reversal of 20211111212011 is 11021211111202.

It is not a de Polignac number, because 20211111212011 - 2¹ = 20211111212009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211111222011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7644405 + ... + 9942793.

It is an arithmetic number, because the mean of its divisors is an integer number (1777643777700).

Almost surely, 2^{20211111212011} is an apocalyptic number.

20211111212011 is a deficient number, since it is larger than the sum of its proper divisors (1120614120389).

20211111212011 is a wasteful number, since it uses less digits than its factorization.

20211111212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322786 (or 2322767 counting only the distinct ones).

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

Adding to 20211111212011 its reverse (11021211111202), we get a palindrome (31232322323213).

The spelling of 20211111212011 in words is "twenty trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, eleven".