13421663 has 4 divisors (see below), whose sum is σ = 13429200. Its totient is φ = 13414128.

The previous prime is 13421651. The next prime is 13421671. The reversal of 13421663 is 36612431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 36612431 = 3371 ⋅10861.

It is a cyclic number.

It is not a de Polignac number, because 13421663 - 2⁸ = 13421407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563 + ... + 5211.

It is an arithmetic number, because the mean of its divisors is an integer number (3357300).

Almost surely, 2^13421663 is an apocalyptic number.

13421663 is a deficient number, since it is larger than the sum of its proper divisors (7537).

13421663 is an equidigital number, since it uses as much as digits as its factorization.

13421663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7536.

The product of its digits is 2592, while the sum is 26.

The square root of 13421663 is about 3663.5587889373. The cubic root of 13421663 is about 237.6487002302.

The spelling of 13421663 in words is "thirteen million, four hundred twenty-one thousand, six hundred sixty-three".