21850340052 has 12 divisors (see below), whose sum is σ = 50984126816. Its totient is φ = 7283446680.

The previous prime is 21850340027. The next prime is 21850340069. The reversal of 21850340052 is 25004305812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910430824 + ... + 910430847.

Almost surely, 2^21850340052 is an apocalyptic number.

It is an amenable number.

21850340052 is an abundant number, since it is smaller than the sum of its proper divisors (29133786764).

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

21850340052 is a wasteful number, since it uses less digits than its factorization.

21850340052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820861678 (or 1820861676 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21850340052 its reverse (25004305812), we get a palindrome (46854645864).

The spelling of 21850340052 in words is "twenty-one billion, eight hundred fifty million, three hundred forty thousand, fifty-two".