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21120212 = 2222923057
BaseRepresentation
bin101000010010…
…0010011010100
31110202000111002
41100210103110
520401321322
62032402432
7344342651
oct120442324
943660432
1021120212
1110a15a23
1270a6418
1344b6289
142b3ac28
151cc2c92
hex14244d4

21120212 has 12 divisors (see below), whose sum is σ = 37123380. Its totient is φ = 10513536.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120212 is 21202112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19945156 + 1175056 = 4466^2 + 1084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21120193 and 21120202.

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, 10613 + ... + 12444.

It is an arithmetic number, because the mean of its divisors is an integer number (3093615).

Almost surely, 221120212 is an apocalyptic number.

It is an amenable number.

21120212 is a deficient number, since it is larger than the sum of its proper divisors (16003168).

21120212 is a wasteful number, since it uses less digits than its factorization.

21120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23290 (or 23288 counting only the distinct ones).

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

The square root of 21120212 is about 4595.6731824620. The cubic root of 21120212 is about 276.4178540772.

Adding to 21120212 its reverse (21202112), we get a palindrome (42322324).

The spelling of 21120212 in words is "twenty-one million, one hundred twenty thousand, two hundred twelve".

Divisors: 1 2 4 229 458 916 23057 46114 92228 5280053 10560106 21120212