Base | Representation |
---|---|
bin | 10011101011000111… |
… | …101111101101101111 |
3 | 2000112012120002112001 |
4 | 103223013233231233 |
5 | 321230340423031 |
6 | 13412100153131 |
7 | 1345325446615 |
oct | 235307575557 |
9 | 60465502461 |
10 | 21124545391 |
11 | 8a60289684 |
12 | 41166987a7 |
13 | 1cb8670901 |
14 | 10457b36b5 |
15 | 83984e861 |
hex | 4eb1efb6f |
21124545391 has 2 divisors, whose sum is σ = 21124545392. Its totient is φ = 21124545390.
The previous prime is 21124545361. The next prime is 21124545461. The reversal of 21124545391 is 19354542112.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 21124545391 - 213 = 21124537199 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 21124545391.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (21124545311) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562272695 + 10562272696.
It is an arithmetic number, because the mean of its divisors is an integer number (10562272696).
Almost surely, 221124545391 is an apocalyptic number.
21124545391 is a deficient number, since it is larger than the sum of its proper divisors (1).
21124545391 is an equidigital number, since it uses as much as digits as its factorization.
21124545391 is an evil number, because the sum of its binary digits is even.
The product of its digits is 43200, while the sum is 37.
The spelling of 21124545391 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, three hundred ninety-one".
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