11821212 has 108 divisors (see below), whose sum is σ = 33972120. Its totient is φ = 3459456.

The previous prime is 11821177. The next prime is 11821223. The reversal of 11821212 is 21212811.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 176403 + ... + 176469.

Almost surely, 2^11821212 is an apocalyptic number.

11821212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11821212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16986060).

11821212 is an abundant number, since it is smaller than the sum of its proper divisors (22150908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11821212 is a wasteful number, since it uses less digits than its factorization.

11821212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 114 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 11821212 is about 3438.1989471233. The cubic root of 11821212 is about 227.8001480486.

It can be divided in two parts, 11821 and 212, that multiplied together give a palindrome (2506052).

The spelling of 11821212 in words is "eleven million, eight hundred twenty-one thousand, two hundred twelve".