13421971 has 4 divisors (see below), whose sum is σ = 13430344. Its totient is φ = 13413600.

The previous prime is 13421951. The next prime is 13421981. The reversal of 13421971 is 17912431.

13421971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13421971 - 2⁷ = 13421843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421951) 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 3 ways as a sum of consecutive naturals, for example, 945 + ... + 5266.

It is an arithmetic number, because the mean of its divisors is an integer number (3357586).

Almost surely, 2^13421971 is an apocalyptic number.

13421971 is a deficient number, since it is larger than the sum of its proper divisors (8373).

13421971 is an equidigital number, since it uses as much as digits as its factorization.

13421971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8372.

The product of its digits is 1512, while the sum is 28.

The square root of 13421971 is about 3663.6008243257. The cubic root of 13421971 is about 237.6505180685.

The spelling of 13421971 in words is "thirteen million, four hundred twenty-one thousand, nine hundred seventy-one".