20111121211011 has 8 divisors (see below), whose sum is σ = 26815001305104. Its totient is φ = 13407327628800.

The previous prime is 20111121211009. The next prime is 20111121211021. The reversal of 20111121211011 is 11011212111102.

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

It is not a de Polignac number, because 20111121211011 - 2¹ = 20111121211009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111121211021) 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, 21083590 + ... + 22016811.

It is an arithmetic number, because the mean of its divisors is an integer number (3351875163138).

Almost surely, 2^{20111121211011} is an apocalyptic number.

20111121211011 is a deficient number, since it is larger than the sum of its proper divisors (6703880094093).

20111121211011 is a wasteful number, since it uses less digits than its factorization.

20111121211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43255941.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 20111121211011 its reverse (11011212111102), we get a palindrome (31122333322113).

Subtracting from 20111121211011 its reverse (11011212111102), we obtain a palindrome (9099909099909).

The spelling of 20111121211011 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, eleven".