13212021 has 8 divisors (see below), whose sum is σ = 17728864. Its totient is φ = 8751600.

The previous prime is 13212013. The next prime is 13212053. The reversal of 13212021 is 12021231.

13212021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13212021 - 2³ = 13212013 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13211988 and 13212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212061) by changing a digit.

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, 13555 + ... + 14496.

It is an arithmetic number, because the mean of its divisors is an integer number (2216108).

Almost surely, 2^13212021 is an apocalyptic number.

It is an amenable number.

13212021 is a deficient number, since it is larger than the sum of its proper divisors (4516843).

13212021 is a wasteful number, since it uses less digits than its factorization.

13212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28211.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 13212021 is about 3634.8343841226. The cubic root of 13212021 is about 236.4048697609.

Adding to 13212021 its reverse (12021231), we get a palindrome (25233252).

The spelling of 13212021 in words is "thirteen million, two hundred twelve thousand, twenty-one".