21552331215 has 128 divisors (see below), whose sum is σ = 37841126400. Its totient is φ = 10449653760.

The previous prime is 21552331189. The next prime is 21552331289. The reversal of 21552331215 is 51213325512.

It is not a de Polignac number, because 21552331215 - 2³² = 17257363919 is a prime.

It is a super-3 number, since 3×21552331215³ (a number of 32 digits) contains 333 as substring.

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 127 ways as a sum of consecutive naturals, for example, 120403996 + ... + 120404174.

It is an arithmetic number, because the mean of its divisors is an integer number (295633800).

Almost surely, 2^21552331215 is an apocalyptic number.

21552331215 is a deficient number, since it is larger than the sum of its proper divisors (16288795185).

21552331215 is a wasteful number, since it uses less digits than its factorization.

21552331215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457.

The product of its digits is 9000, while the sum is 30.

Adding to 21552331215 its reverse (51213325512), we get a palindrome (72765656727).

The spelling of 21552331215 in words is "twenty-one billion, five hundred fifty-two million, three hundred thirty-one thousand, two hundred fifteen".