13021930 has 16 divisors (see below), whose sum is σ = 23673384. Its totient is φ = 5156800.

The previous prime is 13021927. The next prime is 13021993. The reversal of 13021930 is 3912031.

It can be written as a sum of positive squares in 4 ways, for example, as 12837889 + 184041 = 3583^2 + 429^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13021898 and 13021907.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5437 + ... + 7456.

Almost surely, 2^13021930 is an apocalyptic number.

13021930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13021930 is a deficient number, since it is larger than the sum of its proper divisors (10651454).

13021930 is a wasteful number, since it uses less digits than its factorization.

13021930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13001.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 13021930 is about 3608.5911378265. The cubic root of 13021930 is about 235.2656118530.

Adding to 13021930 its reverse (3912031), we get a palindrome (16933961).

The spelling of 13021930 in words is "thirteen million, twenty-one thousand, nine hundred thirty".