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21225212 = 225719293
BaseRepresentation
bin101000011110…
…1111011111100
31110221100111222
41100331323330
520413201322
62034532512
7345261041
oct120757374
943840458
1021225212
1110a878a8
127137138
134521cc8
142b671c8
151ce3e42
hex143defc

21225212 has 12 divisors (see below), whose sum is σ = 37213176. Its totient is φ = 10592880.

The previous prime is 21225209. The next prime is 21225229. The reversal of 21225212 is 21252212.

Adding to 21225212 its reverse (21252212), we get a palindrome (42477424).

Subtracting 21225212 from its reverse (21252212), we obtain a cube (27000 = 303).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 6930.

It is an arithmetic number, because the mean of its divisors is an integer number (3101098).

Almost surely, 221225212 is an apocalyptic number.

It is an amenable number.

21225212 is a deficient number, since it is larger than the sum of its proper divisors (15987964).

21225212 is a wasteful number, since it uses less digits than its factorization.

21225212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9868 (or 9866 counting only the distinct ones).

The product of its digits is 160, while the sum is 17.

The square root of 21225212 is about 4607.0828080251. The cubic root of 21225212 is about 276.8751712874.

The spelling of 21225212 in words is "twenty-one million, two hundred twenty-five thousand, two hundred twelve".

Divisors: 1 2 4 571 1142 2284 9293 18586 37172 5306303 10612606 21225212