21502550243330 has 64 divisors (see below), whose sum is σ = 43299589132800. Its totient is φ = 7633556555520.

The previous prime is 21502550243287. The next prime is 21502550243347. The reversal of 21502550243330 is 3334205520512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11031176 + ... + 12833235.

It is an arithmetic number, because the mean of its divisors is an integer number (676556080200).

Almost surely, 2^{21502550243330} is an apocalyptic number.

21502550243330 is an abundant number, since it is smaller than the sum of its proper divisors (21797038889470).

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

21502550243330 is a wasteful number, since it uses less digits than its factorization.

21502550243330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23864699.

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 21502550243330 its reverse (3334205520512), we get a palindrome (24836755763842).

The spelling of 21502550243330 in words is "twenty-one trillion, five hundred two billion, five hundred fifty million, two hundred forty-three thousand, three hundred thirty".