20211111011 has 48 divisors (see below), whose sum is σ = 27534515904. Its totient is φ = 14395594752.

The previous prime is 20211110929. The next prime is 20211111023. The reversal of 20211111011 is 11011111202.

It is not a de Polignac number, because 20211111011 - 2¹⁰ = 20211109987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211110983 and 20211111001.

It is not an unprimeable number, because it can be changed into a prime (20211111211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 806015 + ... + 830711.

It is an arithmetic number, because the mean of its divisors is an integer number (573635748).

Almost surely, 2^20211111011 is an apocalyptic number.

20211111011 is a deficient number, since it is larger than the sum of its proper divisors (7323404893).

20211111011 is a wasteful number, since it uses less digits than its factorization.

20211111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24780 (or 24757 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20211111011 its reverse (11011111202), we get a palindrome (31222222213).

The spelling of 20211111011 in words is "twenty billion, two hundred eleven million, one hundred eleven thousand, eleven".