15124242221 has 8 divisors (see below), whose sum is σ = 16604265504. Its totient is φ = 13661734320.

The previous prime is 15124242179. The next prime is 15124242229. The reversal of 15124242221 is 12224242151.

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

It is a cyclic number.

It is not a de Polignac number, because 15124242221 - 2³⁰ = 14050500397 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 (15124242229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4377035 + ... + 4380488.

It is an arithmetic number, because the mean of its divisors is an integer number (2075533188).

Almost surely, 2^15124242221 is an apocalyptic number.

15124242221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15124242221 is a deficient number, since it is larger than the sum of its proper divisors (1480023283).

15124242221 is a wasteful number, since it uses less digits than its factorization.

15124242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8757691.

The product of its digits is 2560, while the sum is 26.

Adding to 15124242221 its reverse (12224242151), we get a palindrome (27348484372).

The spelling of 15124242221 in words is "fifteen billion, one hundred twenty-four million, two hundred forty-two thousand, two hundred twenty-one".