21450344552 has 64 divisors (see below), whose sum is σ = 49523510400. Its totient is φ = 8481957120.

The previous prime is 21450344551. The next prime is 21450344623. The reversal of 21450344552 is 25544305412.

It is not an unprimeable number, because it can be changed into a prime (21450344551) 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, 1982774 + ... + 1993562.

It is an arithmetic number, because the mean of its divisors is an integer number (773804850).

Almost surely, 2^21450344552 is an apocalyptic number.

It is an amenable number.

21450344552 is an abundant number, since it is smaller than the sum of its proper divisors (28073165848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21450344552 is a wasteful number, since it uses less digits than its factorization.

21450344552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13546 (or 13542 counting only the distinct ones).

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

Adding to 21450344552 its reverse (25544305412), we get a palindrome (46994649964).

The spelling of 21450344552 in words is "twenty-one billion, four hundred fifty million, three hundred forty-four thousand, five hundred fifty-two".