13221290 has 8 divisors (see below), whose sum is σ = 23798340. Its totient is φ = 5288512.

The previous prime is 13221289. The next prime is 13221293. The reversal of 13221290 is 9212231.

It can be written as a sum of positive squares in 2 ways, for example, as 12313081 + 908209 = 3509^2 + 953^2 .

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

It is a super-3 number, since 3×13221290³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13221293) 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, 661055 + ... + 661074.

Almost surely, 2^13221290 is an apocalyptic number.

13221290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13221290 is a deficient number, since it is larger than the sum of its proper divisors (10577050).

13221290 is a wasteful number, since it uses less digits than its factorization.

13221290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322136.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13221290 is about 3636.1091842793. The cubic root of 13221290 is about 236.4601407527.

The spelling of 13221290 in words is "thirteen million, two hundred twenty-one thousand, two hundred ninety".