13427421 has 16 divisors (see below), whose sum is σ = 20880000. Its totient is φ = 7672224.

The previous prime is 13427413. The next prime is 13427443. The reversal of 13427421 is 12472431.

It is a happy number.

It is not a de Polignac number, because 13427421 - 2³ = 13427413 is a prime.

It is a super-2 number, since 2×13427421² = 360591269422482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13427391 and 13427400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13427461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5496 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (1305000).

Almost surely, 2^13427421 is an apocalyptic number.

It is an amenable number.

13427421 is a deficient number, since it is larger than the sum of its proper divisors (7452579).

13427421 is an equidigital number, since it uses as much as digits as its factorization.

13427421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13073 (or 13059 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 13427421 is about 3664.3445525769. The cubic root of 13427421 is about 237.6826797647.

Adding to 13427421 its reverse (12472431), we get a palindrome (25899852).

The spelling of 13427421 in words is "thirteen million, four hundred twenty-seven thousand, four hundred twenty-one".