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130421 = 413181
BaseRepresentation
bin11111110101110101
320121220102
4133311311
513133141
62443445
71052144
oct376565
9217812
10130421
1189a95
1263585
1347495
143575b
152899b
hex1fd75

130421 has 4 divisors (see below), whose sum is σ = 133644. Its totient is φ = 127200.

The previous prime is 130411. The next prime is 130423. The reversal of 130421 is 124031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124031 = 314001.

It can be written as a sum of positive squares in 2 ways, for example, as 7921 + 122500 = 89^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-130421 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130423) 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 3 ways as a sum of consecutive naturals, for example, 1550 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (33411).

2130421 is an apocalyptic number.

It is an amenable number.

130421 is a deficient number, since it is larger than the sum of its proper divisors (3223).

130421 is an equidigital number, since it uses as much as digits as its factorization.

130421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 130421 is about 361.1384775955. The cubic root of 130421 is about 50.7125958950.

Adding to 130421 its reverse (124031), we get a palindrome (254452).

The spelling of 130421 in words is "one hundred thirty thousand, four hundred twenty-one".

Divisors: 1 41 3181 130421