13021380 has 36 divisors (see below), whose sum is σ = 39498732. Its totient is φ = 3472320.

The previous prime is 13021367. The next prime is 13021387. The reversal of 13021380 is 8312031.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 4588164 = 2904^2 + 2142^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (13021387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35991 + ... + 36350.

It is an arithmetic number, because the mean of its divisors is an integer number (1097187).

Almost surely, 2^13021380 is an apocalyptic number.

13021380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13021380 is an abundant number, since it is smaller than the sum of its proper divisors (26477352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13021380 is a wasteful number, since it uses less digits than its factorization.

13021380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72356 (or 72351 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 13021380 is about 3608.5149299954. The cubic root of 13021380 is about 235.2622995456.

The spelling of 13021380 in words is "thirteen million, twenty-one thousand, three hundred eighty".