Base | Representation |
---|---|
bin | 10011100011110100… |
… | …101011001110001001 |
3 | 2000012200011111220001 |
4 | 103203310223032021 |
5 | 321003014340422 |
6 | 13352004003001 |
7 | 1342310644654 |
oct | 234364531611 |
9 | 60180144801 |
10 | 21002105737 |
11 | 89a8160988 |
12 | 40a1690461 |
13 | 1c991a1402 |
14 | 103342089b |
15 | 82dc16227 |
hex | 4e3d2b389 |
21002105737 has 2 divisors, whose sum is σ = 21002105738. Its totient is φ = 21002105736.
The previous prime is 21002105731. The next prime is 21002105801. The reversal of 21002105737 is 73750120012.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 12637357056 + 8364748681 = 112416^2 + 91459^2 .
It is a cyclic number.
It is not a de Polignac number, because 21002105737 - 227 = 20867888009 is a prime.
It is not a weakly prime, because it can be changed into another prime (21002105731) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501052868 + 10501052869.
It is an arithmetic number, because the mean of its divisors is an integer number (10501052869).
Almost surely, 221002105737 is an apocalyptic number.
It is an amenable number.
21002105737 is a deficient number, since it is larger than the sum of its proper divisors (1).
21002105737 is an equidigital number, since it uses as much as digits as its factorization.
21002105737 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2940, while the sum is 28.
Adding to 21002105737 its reverse (73750120012), we get a palindrome (94752225749).
The spelling of 21002105737 in words is "twenty-one billion, two million, one hundred five thousand, seven hundred thirty-seven".
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