13221975 has 48 divisors (see below), whose sum is σ = 23998464. Its totient is φ = 6384000.

The previous prime is 13221953. The next prime is 13221977. The reversal of 13221975 is 57912231.

It is not a de Polignac number, because 13221975 - 2⁶ = 13221911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69130 + ... + 69320.

It is an arithmetic number, because the mean of its divisors is an integer number (499968).

Almost surely, 2^13221975 is an apocalyptic number.

13221975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13221975 is a deficient number, since it is larger than the sum of its proper divisors (10776489).

13221975 is a wasteful number, since it uses less digits than its factorization.

13221975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 283 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 13221975 is about 3636.2033771504. The cubic root of 13221975 is about 236.4642243784.

It can be divided in two parts, 13221 and 975, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 13221975 in words is "thirteen million, two hundred twenty-one thousand, nine hundred seventy-five".