21202212 has 24 divisors (see below), whose sum is σ = 49803712. Its totient is φ = 7020000.

The previous prime is 21202211. The next prime is 21202261. The reversal of 21202212 is 21220212.

It is a super-3 number, since 3×21202212³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21202211) 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, 4039 + ... + 7662.

Almost surely, 2^21202212 is an apocalyptic number.

It is an amenable number.

21202212 is an abundant number, since it is smaller than the sum of its proper divisors (28601500).

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

21202212 is a wasteful number, since it uses less digits than its factorization.

21202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11859 (or 11857 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21202212 is about 4604.5859748733. The cubic root of 21202212 is about 276.7751262634.

Adding to 21202212 its reverse (21220212), we get a palindrome (42422424).

The spelling of 21202212 in words is "twenty-one million, two hundred two thousand, two hundred twelve".