20010111211 has 4 divisors (see below), whose sum is σ = 20014468672. Its totient is φ = 20005753752.

The previous prime is 20010111203. The next prime is 20010111221. The reversal of 20010111211 is 11211101002.

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 20010111211 - 2³ = 20010111203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010111221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2171835 + ... + 2181028.

It is an arithmetic number, because the mean of its divisors is an integer number (5003617168).

Almost surely, 2^20010111211 is an apocalyptic number.

20010111211 is a deficient number, since it is larger than the sum of its proper divisors (4357461).

20010111211 is an equidigital number, since it uses as much as digits as its factorization.

20010111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357460.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20010111211 its reverse (11211101002), we get a palindrome (31221212213).

The spelling of 20010111211 in words is "twenty billion, ten million, one hundred eleven thousand, two hundred eleven".