13421661 has 8 divisors (see below), whose sum is σ = 19522464. Its totient is φ = 8134320.

The previous prime is 13421651. The next prime is 13421671. The reversal of 13421661 is 16612431.

It is an interprime number because it is at equal distance from previous prime (13421651) and next prime (13421671).

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

It is not a de Polignac number, because 13421661 - 2⁷ = 13421533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421651) 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, 203326 + ... + 203391.

It is an arithmetic number, because the mean of its divisors is an integer number (2440308).

Almost surely, 2^13421661 is an apocalyptic number.

13421661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13421661 is a deficient number, since it is larger than the sum of its proper divisors (6100803).

13421661 is a wasteful number, since it uses less digits than its factorization.

13421661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406731.

The product of its digits is 864, while the sum is 24.

The square root of 13421661 is about 3663.5585159787. The cubic root of 13421661 is about 237.6486884260.

It can be divided in two parts, 1342 and 1661, that added together give a palindrome (3003).

The spelling of 13421661 in words is "thirteen million, four hundred twenty-one thousand, six hundred sixty-one".