20011211010211 has 4 divisors (see below), whose sum is σ = 20011255945912. Its totient is φ = 20011166074512.

The previous prime is 20011211010179. The next prime is 20011211010221. The reversal of 20011211010211 is 11201011211002.

It is a happy number.

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 20011211010211 - 2⁵ = 20011211010179 is a prime.

It is a super-2 number, since 2×20011211010211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011211010191 and 20011211010200.

It is not an unprimeable number, because it can be changed into a prime (20011211010221) 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, 21793101 + ... + 22692766.

It is an arithmetic number, because the mean of its divisors is an integer number (5002813986478).

Almost surely, 2^{20011211010211} is an apocalyptic number.

20011211010211 is a deficient number, since it is larger than the sum of its proper divisors (44935701).

20011211010211 is an equidigital number, since it uses as much as digits as its factorization.

20011211010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44935700.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20011211010211 its reverse (11201011211002), we get a palindrome (31212222221213).

The spelling of 20011211010211 in words is "twenty trillion, eleven billion, two hundred eleven million, ten thousand, two hundred eleven".