20931112911 has 8 divisors (see below), whose sum is σ = 27915755184. Its totient is φ = 13950272960.

The previous prime is 20931112907. The next prime is 20931112949. The reversal of 20931112911 is 11921113902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20931112911 - 2² = 20931112907 is a prime.

It is a super-2 number, since 2×20931112911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20931112711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937710 + ... + 959771.

It is an arithmetic number, because the mean of its divisors is an integer number (3489469398).

Almost surely, 2^20931112911 is an apocalyptic number.

20931112911 is a deficient number, since it is larger than the sum of its proper divisors (6984642273).

20931112911 is a wasteful number, since it uses less digits than its factorization.

20931112911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901161.

The product of its (nonzero) digits is 972, while the sum is 30.

Subtracting from 20931112911 its reverse (11921113902), we obtain a palindrome (9009999009).

It can be divided in two parts, 209311 and 12911, that added together give a palindrome (222222).

The spelling of 20931112911 in words is "twenty billion, nine hundred thirty-one million, one hundred twelve thousand, nine hundred eleven".