20011023211 has 4 divisors (see below), whose sum is σ = 20017305352. Its totient is φ = 20004741072.

The previous prime is 20011023209. The next prime is 20011023223. The reversal of 20011023211 is 11232011002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20011023211 - 2¹ = 20011023209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011023191 and 20011023200.

It is not an unprimeable number, because it can be changed into a prime (20011023511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3136290 + ... + 3142663.

It is an arithmetic number, because the mean of its divisors is an integer number (5004326338).

Almost surely, 2^20011023211 is an apocalyptic number.

20011023211 is a deficient number, since it is larger than the sum of its proper divisors (6282141).

20011023211 is an equidigital number, since it uses as much as digits as its factorization.

20011023211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282140.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20011023211 its reverse (11232011002), we get a palindrome (31243034213).

The spelling of 20011023211 in words is "twenty billion, eleven million, twenty-three thousand, two hundred eleven".