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21021212 = 225255303
BaseRepresentation
bin101000000110…
…0001000011100
31110112222200102
41100030020130
520340134322
62030320232
7343451222
oct120141034
943488612
1021021212
1110958603
127059078
1344801b4
142b12b12
151ca3792
hex140c21c

21021212 has 6 divisors (see below), whose sum is σ = 36787128. Its totient is φ = 10510604.

The previous prime is 21021181. The next prime is 21021229. The reversal of 21021212 is 21212012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021193 and 21021202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627648 + ... + 2627655.

It is an arithmetic number, because the mean of its divisors is an integer number (6131188).

Almost surely, 221021212 is an apocalyptic number.

It is an amenable number.

21021212 is a deficient number, since it is larger than the sum of its proper divisors (15765916).

21021212 is a wasteful number, since it uses less digits than its factorization.

21021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255307 (or 5255305 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21021212 is about 4584.8895297488. The cubic root of 21021212 is about 275.9852789180.

Adding to 21021212 its reverse (21212012), we get a palindrome (42233224).

The spelling of 21021212 in words is "twenty-one million, twenty-one thousand, two hundred twelve".

Divisors: 1 2 4 5255303 10510606 21021212