20101220211 has 8 divisors (see below), whose sum is σ = 26818415824. Its totient is φ = 13392419040.

The previous prime is 20101220203. The next prime is 20101220233. The reversal of 20101220211 is 11202210102.

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

It is not a de Polignac number, because 20101220211 - 2³ = 20101220203 is a prime.

It is a super-2 number, since 2×20101220211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101220201) 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, 2093020 + ... + 2102601.

It is an arithmetic number, because the mean of its divisors is an integer number (3352301978).

Almost surely, 2^20101220211 is an apocalyptic number.

20101220211 is a deficient number, since it is larger than the sum of its proper divisors (6717195613).

20101220211 is a wasteful number, since it uses less digits than its factorization.

20101220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197221.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20101220211 its reverse (11202210102), we get a palindrome (31303430313).

It can be divided in two parts, 2010 and 1220211, that added together give a palindrome (1222221).

The spelling of 20101220211 in words is "twenty billion, one hundred one million, two hundred twenty thousand, two hundred eleven".