15124550221 has 12 divisors (see below), whose sum is σ = 17413614144. Its totient is φ = 13025925000.

The previous prime is 15124550219. The next prime is 15124550239. The reversal of 15124550221 is 12205542151.

It is not a de Polignac number, because 15124550221 - 2¹ = 15124550219 is a prime.

It is a super-2 number, since 2×15124550221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15124550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15124550291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1900405 + ... + 1908346.

It is an arithmetic number, because the mean of its divisors is an integer number (1451134512).

Almost surely, 2^15124550221 is an apocalyptic number.

15124550221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15124550221 is a deficient number, since it is larger than the sum of its proper divisors (2289063923).

15124550221 is a wasteful number, since it uses less digits than its factorization.

15124550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808800 (or 3808781 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 15124550221 in words is "fifteen billion, one hundred twenty-four million, five hundred fifty thousand, two hundred twenty-one".