21552303441 has 8 divisors (see below), whose sum is σ = 28737087904.
Its totient is φ = 14367860640.
The previous prime is 21552303413. The next prime is 21552303449. The reversal of 21552303441 is 14430325512.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 21552303441 - 27 = 21552303313 is a prime.
It is a super-2 number, since 2×215523034412 (a number of 21 digits) contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 21552303399 and 21552303408.
It is not an unprimeable number, because it can be changed into a prime (21552303449) 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, 176586 + ... + 272556.
It is an arithmetic number, because the mean of its divisors is an integer number (3592135988).
Almost surely, 221552303441 is an apocalyptic number.
It is an amenable number.
21552303441 is a deficient number, since it is larger than the sum of its proper divisors (7184784463).
21552303441 is an equidigital number, since it uses as much as digits as its factorization.
21552303441 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 170831.
The product of its (nonzero) digits is 14400, while the sum is 30.
Adding to 21552303441 its reverse (14430325512), we get a palindrome (35982628953).
The spelling of 21552303441 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred forty-one".