15221442 has 8 divisors (see below), whose sum is σ = 30442896. Its totient is φ = 5073812.

The previous prime is 15221431. The next prime is 15221501. The reversal of 15221442 is 24412251.

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

15221442 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268448 + ... + 1268459.

It is an arithmetic number, because the mean of its divisors is an integer number (3805362).

Almost surely, 2^15221442 is an apocalyptic number.

15221442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

15221442 is a wasteful number, since it uses less digits than its factorization.

15221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536912.

The product of its digits is 640, while the sum is 21.

The square root of 15221442 is about 3901.4666473007. The cubic root of 15221442 is about 247.8288903801.

Adding to 15221442 its reverse (24412251), we get a palindrome (39633693).

The spelling of 15221442 in words is "fifteen million, two hundred twenty-one thousand, four hundred forty-two".