13200021 has 12 divisors (see below), whose sum is σ = 19427148. Its totient is φ = 8633664.

The previous prime is 13200001. The next prime is 13200101. The reversal of 13200021 is 12000231.

It is a happy number.

13200021 is digitally balanced in base 2, because in such base 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 3651921 + 9548100 = 1911^2 + 3090^2 .

It is not a de Polignac number, because 13200021 - 2⁶ = 13199957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 13199976 and 13200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13200001) 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, 13360 + ... + 14313.

It is an arithmetic number, because the mean of its divisors is an integer number (1618929).

Almost surely, 2^13200021 is an apocalyptic number.

It is an amenable number.

13200021 is a deficient number, since it is larger than the sum of its proper divisors (6227127).

13200021 is a wasteful number, since it uses less digits than its factorization.

13200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27732 (or 27729 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 13200021 is about 3633.1833149457. The cubic root of 13200021 is about 236.3332754216. Note that the first 3 decimals are identical.

Adding to 13200021 its reverse (12000231), we get a palindrome (25200252).

The spelling of 13200021 in words is "thirteen million, two hundred thousand, twenty-one".