20111212 has 48 divisors (see below), whose sum is σ = 39997440. Its totient is φ = 8769600.

The previous prime is 20111183. The next prime is 20111213. The reversal of 20111212 is 21211102.

It is not an unprimeable number, because it can be changed into a prime (20111213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158293 + ... + 158419.

It is an arithmetic number, because the mean of its divisors is an integer number (833280).

Almost surely, 2^20111212 is an apocalyptic number.

20111212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20111212 is a deficient number, since it is larger than the sum of its proper divisors (19886228).

20111212 is a wasteful number, since it uses less digits than its factorization.

20111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 20111212 is about 4484.5525975285. The cubic root of 20111212 is about 271.9439583216.

Adding to 20111212 its reverse (21211102), we get a palindrome (41322314).

It can be divided in two parts, 2011 and 1212, that added together give a palindrome (3223).

The spelling of 20111212 in words is "twenty million, one hundred eleven thousand, two hundred twelve".