13221650 has 24 divisors (see below), whose sum is σ = 26485284. Its totient is φ = 4881600.

The previous prime is 13221647. The next prime is 13221667. The reversal of 13221650 is 5612231.

It can be written as a sum of positive squares in 6 ways, for example, as 3179089 + 10042561 = 1783^2 + 3169^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9521 + ... + 10820.

Almost surely, 2^13221650 is an apocalyptic number.

13221650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13221650 is an abundant number, since it is smaller than the sum of its proper divisors (13263634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221650 is a wasteful number, since it uses less digits than its factorization.

13221650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20366 (or 20361 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13221650 is about 3636.1586874063. The cubic root of 13221650 is about 236.4622869093.

Adding to 13221650 its reverse (5612231), we get a palindrome (18833881).

The spelling of 13221650 in words is "thirteen million, two hundred twenty-one thousand, six hundred fifty".