21552305442 has 8 divisors (see below), whose sum is σ = 43104610896. Its totient is φ = 7184101812.

The previous prime is 21552305413. The next prime is 21552305483. The reversal of 21552305442 is 24450325512.

It is a happy number.

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

21552305442 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796025448 + ... + 1796025459.

It is an arithmetic number, because the mean of its divisors is an integer number (5388076362).

Almost surely, 2^21552305442 is an apocalyptic number.

21552305442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21552305442 is a wasteful number, since it uses less digits than its factorization.

21552305442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592050912.

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 21552305442 in words is "twenty-one billion, five hundred fifty-two million, three hundred five thousand, four hundred forty-two".