13021812 has 36 divisors (see below), whose sum is σ = 34054020. Its totient is φ = 4190592.

The previous prime is 13021777. The next prime is 13021823. The reversal of 13021812 is 21812031.

13021812 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7986276 + 5035536 = 2826^2 + 2244^2 .

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 a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5193 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (945945).

Almost surely, 2^13021812 is an apocalyptic number.

13021812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13021812 is an abundant number, since it is smaller than the sum of its proper divisors (21032208).

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

13021812 is a wasteful number, since it uses less digits than its factorization.

13021812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12512 (or 12507 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 13021812 is about 3608.5747879184. The cubic root of 13021812 is about 235.2649012204.

Adding to 13021812 its reverse (21812031), we get a palindrome (34833843).

The spelling of 13021812 in words is "thirteen million, twenty-one thousand, eight hundred twelve".