Base | Representation |
---|---|
bin | 101000010110… |
… | …0111011100001 |
3 | 1110210210222000 |
4 | 1100230323201 |
5 | 20403434203 |
6 | 2033234213 |
7 | 344550666 |
oct | 120547341 |
9 | 43723860 |
10 | 21155553 |
11 | 10a3a531 |
12 | 7102969 |
13 | 44c93a3 |
14 | 2b49a6d |
15 | 1ccd4a3 |
hex | 142cee1 |
21155553 has 16 divisors (see below), whose sum is σ = 31555200. Its totient is φ = 14007600.
The previous prime is 21155551. The next prime is 21155591. The reversal of 21155553 is 35555112.
It is not a de Polignac number, because 21155553 - 21 = 21155551 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (21155551) 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, 1483 + ... + 6671.
It is an arithmetic number, because the mean of its divisors is an integer number (1972200).
Almost surely, 221155553 is an apocalyptic number.
It is an amenable number.
21155553 is a deficient number, since it is larger than the sum of its proper divisors (10399647).
21155553 is a wasteful number, since it uses less digits than its factorization.
21155553 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5349 (or 5343 counting only the distinct ones).
The product of its digits is 3750, while the sum is 27.
The square root of 21155553 is about 4599.5166050358. The cubic root of 21155553 is about 276.5719472211.
The spelling of 21155553 in words is "twenty-one million, one hundred fifty-five thousand, five hundred fifty-three".
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