13421221 has 8 divisors (see below), whose sum is σ = 14702688. Its totient is φ = 12150000.

The previous prime is 13421207. The next prime is 13421251. The reversal of 13421221 is 12212431.

13421221 is digitally balanced in base 2, 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 a 5-Lehmer number, since φ(13421221) divides (13421221-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 13421221 - 2¹¹ = 13419173 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13421195 and 13421204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (1837836).

Almost surely, 2^13421221 is an apocalyptic number.

13421221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13421221 is a deficient number, since it is larger than the sum of its proper divisors (1281467).

13421221 is a wasteful number, since it uses less digits than its factorization.

13421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123.

The product of its digits is 96, while the sum is 16.

The square root of 13421221 is about 3663.4984645827. The cubic root of 13421221 is about 237.6460914656.

Adding to 13421221 its reverse (12212431), we get a palindrome (25633652).

The spelling of 13421221 in words is "thirteen million, four hundred twenty-one thousand, two hundred twenty-one".