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10212121 = 175211153
BaseRepresentation
bin100110111101…
…001100011001
3201012211101201
4212331030121
510103241441
61002514201
7152541643
oct46751431
921184351
1010212121
115845577
123505961
13216729a
1414db893
15d6ac31
hex9bd319

10212121 has 8 divisors (see below), whose sum is σ = 10842984. Its totient is φ = 9584640.

The previous prime is 10212119. The next prime is 10212131. The reversal of 10212121 is 12121201.

It can be written as a sum of positive squares in 4 ways, for example, as 3115225 + 7096896 = 1765^2 + 2664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10212121 - 21 = 10212119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212098 and 10212107.

It is not an unprimeable number, because it can be changed into a prime (10212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8281 + ... + 9433.

It is an arithmetic number, because the mean of its divisors is an integer number (1355373).

Almost surely, 210212121 is an apocalyptic number.

It is an amenable number.

10212121 is a deficient number, since it is larger than the sum of its proper divisors (630863).

10212121 is a wasteful number, since it uses less digits than its factorization.

10212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 10212121 is about 3195.6409372769. The cubic root of 10212121 is about 216.9561592506.

Adding to 10212121 its reverse (12121201), we get a palindrome (22333322).

The spelling of 10212121 in words is "ten million, two hundred twelve thousand, one hundred twenty-one".

Divisors: 1 17 521 1153 8857 19601 600713 10212121