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21320113 = 77327581
BaseRepresentation
bin101000101010…
…1000110110001
31111010011200211
41101111012301
520424220423
62040544121
7346134523
oct121250661
944104624
1021320113
1111042131
127182041
134556269
142b8da13
151d1210d
hex14551b1

21320113 has 4 divisors (see below), whose sum is σ = 21348468. Its totient is φ = 21291760.

The previous prime is 21320107. The next prime is 21320183. The reversal of 21320113 is 31102312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12723489 + 8596624 = 3567^2 + 2932^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320113 - 25 = 21320081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320093 and 21320102.

It is not an unprimeable number, because it can be changed into a prime (21320183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13018 + ... + 14563.

It is an arithmetic number, because the mean of its divisors is an integer number (5337117).

Almost surely, 221320113 is an apocalyptic number.

It is an amenable number.

21320113 is a deficient number, since it is larger than the sum of its proper divisors (28355).

21320113 is an equidigital number, since it uses as much as digits as its factorization.

21320113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28354.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21320113 is about 4617.3707886632. The cubic root of 21320113 is about 277.2872074820.

Adding to 21320113 its reverse (31102312), we get a palindrome (52422425).

The spelling of 21320113 in words is "twenty-one million, three hundred twenty thousand, one hundred thirteen".

Divisors: 1 773 27581 21320113