13421121 has 32 divisors (see below), whose sum is σ = 21946368. Its totient is φ = 7128000.

The previous prime is 13421071. The next prime is 13421129. The reversal of 13421121 is 12112431.

It is not a de Polignac number, because 13421121 - 2¹³ = 13412929 is a prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 13421121.

It is not an unprimeable number, because it can be changed into a prime (13421129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17496 + ... + 18246.

It is an arithmetic number, because the mean of its divisors is an integer number (685824).

Almost surely, 2^13421121 is an apocalyptic number.

It is an amenable number.

13421121 is a deficient number, since it is larger than the sum of its proper divisors (8525247).

13421121 is a wasteful number, since it uses less digits than its factorization.

13421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821.

The product of its digits is 48, while the sum is 15.

The square root of 13421121 is about 3663.4848164009. The cubic root of 13421121 is about 237.6455012394.

Adding to 13421121 its reverse (12112431), we get a palindrome (25533552).

The spelling of 13421121 in words is "thirteen million, four hundred twenty-one thousand, one hundred twenty-one".