15220445242 has 4 divisors (see below), whose sum is σ = 22830667866. Its totient is φ = 7610222620.

The previous prime is 15220445209. The next prime is 15220445243. The reversal of 15220445242 is 24254402251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24254402251 = 233 ⋅104096147.

It can be written as a sum of positive squares in only one way, i.e., 14291963401 + 928481841 = 119549^2 + 30471^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (15220445243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3805111309 + ... + 3805111312.

Almost surely, 2^15220445242 is an apocalyptic number.

15220445242 is a deficient number, since it is larger than the sum of its proper divisors (7610222624).

15220445242 is an equidigital number, since it uses as much as digits as its factorization.

15220445242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610222623.

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 15220445242 its reverse (24254402251), we get a palindrome (39474847493).

The spelling of 15220445242 in words is "fifteen billion, two hundred twenty million, four hundred forty-five thousand, two hundred forty-two".