21206503050 has 24 divisors (see below), whose sum is σ = 52592127936. Its totient is φ = 5655067440.

The previous prime is 21206503039. The next prime is 21206503081. The reversal of 21206503050 is 5030560212.

21206503050 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21206503050.

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 11 ways as a sum of consecutive naturals, for example, 70688194 + ... + 70688493.

It is an arithmetic number, because the mean of its divisors is an integer number (2191338664).

Almost surely, 2^21206503050 is an apocalyptic number.

21206503050 is an abundant number, since it is smaller than the sum of its proper divisors (31385624886).

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

21206503050 is a wasteful number, since it uses less digits than its factorization.

21206503050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141376702 (or 141376697 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21206503050 in words is "twenty-one billion, two hundred six million, five hundred three thousand, fifty".