13142421 has 6 divisors (see below), whose sum is σ = 18983510. Its totient is φ = 8761608.

The previous prime is 13142417. The next prime is 13142431. The reversal of 13142421 is 12424131.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 4796100 = 2889^2 + 2190^2 .

It is not a de Polignac number, because 13142421 - 2² = 13142417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13142394 and 13142403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13142401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 730126 + ... + 730143.

Almost surely, 2^13142421 is an apocalyptic number.

It is an amenable number.

13142421 is a deficient number, since it is larger than the sum of its proper divisors (5841089).

13142421 is a wasteful number, since it uses less digits than its factorization.

13142421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460275 (or 1460272 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 13142421 is about 3625.2477156741. The cubic root of 13142421 is about 235.9890172520.

Adding to 13142421 its reverse (12424131), we get a palindrome (25566552).

The spelling of 13142421 in words is "thirteen million, one hundred forty-two thousand, four hundred twenty-one".