15550342221 has 16 divisors (see below), whose sum is σ = 21987612864. Its totient is φ = 9741882624.

The previous prime is 15550342219. The next prime is 15550342261. The reversal of 15550342221 is 12224305551.

It is not a de Polignac number, because 15550342221 - 2¹ = 15550342219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550342261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204306 + ... + 269891.

It is an arithmetic number, because the mean of its divisors is an integer number (1374225804).

Almost surely, 2^15550342221 is an apocalyptic number.

It is an amenable number.

15550342221 is a deficient number, since it is larger than the sum of its proper divisors (6437270643).

15550342221 is a wasteful number, since it uses less digits than its factorization.

15550342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474860.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 15550342221 its reverse (12224305551), we get a palindrome (27774647772).

The spelling of 15550342221 in words is "fifteen billion, five hundred fifty million, three hundred forty-two thousand, two hundred twenty-one".