Base | Representation |
---|---|
bin | 101000010010… |
… | …0100010111010 |
3 | 1110202001212001 |
4 | 1100210202322 |
5 | 20401334320 |
6 | 2032411214 |
7 | 344345605 |
oct | 120444272 |
9 | 43661761 |
10 | 21121210 |
11 | 10a16750 |
12 | 70a6b0a |
13 | 44b6876 |
14 | 2b3b33c |
15 | 1cc320a |
hex | 14248ba |
21121210 has 32 divisors (see below), whose sum is σ = 41772672. Its totient is φ = 7625280.
The previous prime is 21121207. The next prime is 21121211. The reversal of 21121210 is 1212112.
It is a super-2 number, since 2×211212102 = 892211023728200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is not an unprimeable number, because it can be changed into a prime (21121211) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16659 + ... + 17881.
It is an arithmetic number, because the mean of its divisors is an integer number (1305396).
Almost surely, 221121210 is an apocalyptic number.
21121210 is a deficient number, since it is larger than the sum of its proper divisors (20651462).
21121210 is a wasteful number, since it uses less digits than its factorization.
21121210 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1398.
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 21121210 is about 4595.7817615722. The cubic root of 21121210 is about 276.4222078952.
Adding to 21121210 its reverse (1212112), we get a palindrome (22333322).
The spelling of 21121210 in words is "twenty-one million, one hundred twenty-one thousand, two hundred ten".
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