13018821 has 16 divisors (see below), whose sum is σ = 18454464. Its totient is φ = 8135424.

The previous prime is 13018807. The next prime is 13018823. The reversal of 13018821 is 12881031.

13018821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13018821 - 2⁶ = 13018757 is a prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 13018791 and 13018800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13018823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19926 + ... + 20568.

It is an arithmetic number, because the mean of its divisors is an integer number (1153404).

Almost surely, 2^13018821 is an apocalyptic number.

13018821 is the 1929-th nonagonal number.

It is an amenable number.

13018821 is a deficient number, since it is larger than the sum of its proper divisors (5435643).

13018821 is a wasteful number, since it uses less digits than its factorization.

13018821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 13018821 is about 3608.1603345749. The cubic root of 13018821 is about 235.2468870556.

Adding to 13018821 its reverse (12881031), we get a palindrome (25899852).

The spelling of 13018821 in words is "thirteen million, eighteen thousand, eight hundred twenty-one".