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21115530216523 is a prime number
BaseRepresentation
bin1001100110100010101111…
…01011011000010001001011
32202202121212121101000102001
410303101113223120101023
510231424101213412043
6112524201330051431
74306355344302421
oct463212753302113
982677777330361
1021115530216523
116801056365616
1224503b8419b77
13ba225570c832
1452ddd6129111
152693e3e8274d
hex133457ad844b

21115530216523 has 2 divisors, whose sum is σ = 21115530216524. Its totient is φ = 21115530216522.

The previous prime is 21115530216479. The next prime is 21115530216577. The reversal of 21115530216523 is 32561203551112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21115530216523 - 241 = 18916506960971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21115530216623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557765108261 + 10557765108262.

It is an arithmetic number, because the mean of its divisors is an integer number (10557765108262).

Almost surely, 221115530216523 is an apocalyptic number.

21115530216523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115530216523 is an equidigital number, since it uses as much as digits as its factorization.

21115530216523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 37.

Adding to 21115530216523 its reverse (32561203551112), we get a palindrome (53676733767635).

The spelling of 21115530216523 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred sixteen thousand, five hundred twenty-three".