20211312111 has 16 divisors (see below), whose sum is σ = 28400077440. Its totient is φ = 12750043680.

The previous prime is 20211312091. The next prime is 20211312127. The reversal of 20211312111 is 11121311202.

It is not a de Polignac number, because 20211312111 - 2⁹ = 20211311599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211312131) 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, 159225 + ... + 256466.

It is an arithmetic number, because the mean of its divisors is an integer number (1775004840).

Almost surely, 2^20211312111 is an apocalyptic number.

20211312111 is a deficient number, since it is larger than the sum of its proper divisors (8188765329).

20211312111 is a wasteful number, since it uses less digits than its factorization.

20211312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416566.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20211312111 its reverse (11121311202), we get a palindrome (31332623313).

Subtracting from 20211312111 its reverse (11121311202), we obtain a palindrome (9090000909).

The spelling of 20211312111 in words is "twenty billion, two hundred eleven million, three hundred twelve thousand, one hundred eleven".