15042405221 has 4 divisors (see below), whose sum is σ = 15211421100. Its totient is φ = 14873389344.

The previous prime is 15042405199. The next prime is 15042405229. The reversal of 15042405221 is 12250424051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12250424051 = 223 ⋅54934637.

It can be written as a sum of positive squares in 2 ways, for example, as 3925022500 + 11117382721 = 62650^2 + 105439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15042405221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15042405229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84507806 + ... + 84507983.

It is an arithmetic number, because the mean of its divisors is an integer number (3802855275).

Almost surely, 2^15042405221 is an apocalyptic number.

It is an amenable number.

15042405221 is a deficient number, since it is larger than the sum of its proper divisors (169015879).

15042405221 is an equidigital number, since it uses as much as digits as its factorization.

15042405221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169015878.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 15042405221 its reverse (12250424051), we get a palindrome (27292829272).

The spelling of 15042405221 in words is "fifteen billion, forty-two million, four hundred five thousand, two hundred twenty-one".