13142221 has 4 divisors (see below), whose sum is σ = 13272444. Its totient is φ = 13012000.

The previous prime is 13142197. The next prime is 13142231. The reversal of 13142221 is 12224131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 990025 = 3486^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 13142221 - 2⁵ = 13142189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13142195 and 13142204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13142231) 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, 64960 + ... + 65161.

It is an arithmetic number, because the mean of its divisors is an integer number (3318111).

Almost surely, 2^13142221 is an apocalyptic number.

It is an amenable number.

13142221 is a deficient number, since it is larger than the sum of its proper divisors (130223).

13142221 is a wasteful number, since it uses less digits than its factorization.

13142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130222.

The product of its digits is 96, while the sum is 16.

The square root of 13142221 is about 3625.2201312472. The cubic root of 13142221 is about 235.9878201605.

Adding to 13142221 its reverse (12224131), we get a palindrome (25366352).

The spelling of 13142221 in words is "thirteen million, one hundred forty-two thousand, two hundred twenty-one".