21550443452 has 12 divisors (see below), whose sum is σ = 38633112336. Its totient is φ = 10512411360.

The previous prime is 21550443389. The next prime is 21550443461. The reversal of 21550443452 is 25434405512.

It is a super-3 number, since 3×21550443452³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65702408 + ... + 65702735.

It is an arithmetic number, because the mean of its divisors is an integer number (3219426028).

Almost surely, 2^21550443452 is an apocalyptic number.

It is an amenable number.

21550443452 is a deficient number, since it is larger than the sum of its proper divisors (17082668884).

21550443452 is a wasteful number, since it uses less digits than its factorization.

21550443452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131405188 (or 131405186 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 21550443452 its reverse (25434405512), we get a palindrome (46984848964).

The spelling of 21550443452 in words is "twenty-one billion, five hundred fifty million, four hundred forty-three thousand, four hundred fifty-two".