13221570 has 32 divisors (see below), whose sum is σ = 32410368. Its totient is φ = 3450368.

The previous prime is 13221553. The next prime is 13221577. The reversal of 13221570 is 7512231.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13221577) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3279 + ... + 6098.

It is an arithmetic number, because the mean of its divisors is an integer number (1012824).

Almost surely, 2^13221570 is an apocalyptic number.

13221570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13221570 is an abundant number, since it is smaller than the sum of its proper divisors (19188798).

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

13221570 is a wasteful number, since it uses less digits than its factorization.

13221570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13221570 is about 3636.1476867696. The cubic root of 13221570 is about 236.4618099890.

The spelling of 13221570 in words is "thirteen million, two hundred twenty-one thousand, five hundred seventy".