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13300021 = 72271429
BaseRepresentation
bin110010101111…
…000100110101
3221000201012101
4302233010311
511401100041
61153022101
7221022400
oct62570465
927021171
1013300021
117564559
124554931
1329a8947
141aa2d37
15127ab31
hexcaf135

13300021 has 6 divisors (see below), whose sum is σ = 15471510. Its totient is φ = 11399976.

The previous prime is 13299991. The next prime is 13300039. The reversal of 13300021 is 12000331.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 1535121 = 3430^2 + 1239^2 .

It is not a de Polignac number, because 13300021 - 25 = 13299989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13299980 and 13300007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13300051) 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 5 ways as a sum of consecutive naturals, for example, 135666 + ... + 135763.

It is an arithmetic number, because the mean of its divisors is an integer number (2578585).

Almost surely, 213300021 is an apocalyptic number.

It is an amenable number.

13300021 is a deficient number, since it is larger than the sum of its proper divisors (2171489).

13300021 is an equidigital number, since it uses as much as digits as its factorization.

13300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271443 (or 271436 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 13300021 is about 3646.9193849056. The cubic root of 13300021 is about 236.9285749148.

Adding to 13300021 its reverse (12000331), we get a palindrome (25300352).

The spelling of 13300021 in words is "thirteen million, three hundred thousand, twenty-one".

Divisors: 1 7 49 271429 1900003 13300021