21552330215 has 8 divisors (see below), whose sum is σ = 27852242208. Its totient is φ = 15915566880.

The previous prime is 21552330209. The next prime is 21552330221. The reversal of 21552330215 is 51203325512.

It is an interprime number because it is at equal distance from previous prime (21552330209) and next prime (21552330221).

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

It is not a de Polignac number, because 21552330215 - 2¹⁰ = 21552329191 is a prime.

It is a super-3 number, since 3×21552330215³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165787091 + ... + 165787220.

It is an arithmetic number, because the mean of its divisors is an integer number (3481530276).

Almost surely, 2^21552330215 is an apocalyptic number.

21552330215 is a deficient number, since it is larger than the sum of its proper divisors (6299911993).

21552330215 is a wasteful number, since it uses less digits than its factorization.

21552330215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331574329.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21552330215 its reverse (51203325512), we get a palindrome (72755655727).

The spelling of 21552330215 in words is "twenty-one billion, five hundred fifty-two million, three hundred thirty thousand, two hundred fifteen".