Base | Representation |
---|---|
bin | 101001111010… |
… | …0000110111010 |
3 | 1112100021002001 |
4 | 1103310012322 |
5 | 21111041021 |
6 | 2102531214 |
7 | 354516343 |
oct | 123640672 |
9 | 45307061 |
10 | 21971386 |
11 | 11447478 |
12 | 7436b0a |
13 | 4723828 |
14 | 2cbd0ca |
15 | 1de0091 |
hex | 14f41ba |
21971386 has 8 divisors (see below), whose sum is σ = 34093620. Its totient is φ = 10606848.
The previous prime is 21971359. The next prime is 21971387. The reversal of 21971386 is 68317912.
It can be written as a sum of positive squares in 2 ways, for example, as 20421361 + 1550025 = 4519^2 + 1245^2 .
It is a sphenic number, since it is the product of 3 distinct primes.
It is not an unprimeable number, because it can be changed into a prime (21971387) 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 3 ways as a sum of consecutive naturals, for example, 189351 + ... + 189466.
Almost surely, 221971386 is an apocalyptic number.
21971386 is a deficient number, since it is larger than the sum of its proper divisors (12122234).
21971386 is a wasteful number, since it uses less digits than its factorization.
21971386 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 378848.
The product of its digits is 18144, while the sum is 37.
The square root of 21971386 is about 4687.3645047084. The cubic root of 21971386 is about 280.0823992183.
The spelling of 21971386 in words is "twenty-one million, nine hundred seventy-one thousand, three hundred eighty-six".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.000 sec. • engine limits •