15221198 has 4 divisors (see below), whose sum is σ = 22831800. Its totient is φ = 7610598.

The previous prime is 15221197. The next prime is 15221203. The reversal of 15221198 is 89112251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89112251 = 97 ⋅918683.

It is a self number, because there is not a number n which added to its sum of digits gives 15221198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221197) 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 as a sum of consecutive naturals, namely, 3805298 + ... + 3805301.

It is an arithmetic number, because the mean of its divisors is an integer number (5707950).

Almost surely, 2^15221198 is an apocalyptic number.

15221198 is a deficient number, since it is larger than the sum of its proper divisors (7610602).

15221198 is an equidigital number, since it uses as much as digits as its factorization.

15221198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610601.

The product of its digits is 1440, while the sum is 29.

The square root of 15221198 is about 3901.4353768837. The cubic root of 15221198 is about 247.8275661391.

The spelling of 15221198 in words is "fifteen million, two hundred twenty-one thousand, one hundred ninety-eight".