21393883650 has 48 divisors (see below), whose sum is σ = 53122716000. Its totient is φ = 5697951360.

The previous prime is 21393883607. The next prime is 21393883657. The reversal of 21393883650 is 5638839312.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21393883650.

It is not an unprimeable number, because it can be changed into a prime (21393883657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33201 + ... + 209499.

It is an arithmetic number, because the mean of its divisors is an integer number (1106723250).

Almost surely, 2^21393883650 is an apocalyptic number.

21393883650 is an abundant number, since it is smaller than the sum of its proper divisors (31728832350).

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

21393883650 is a wasteful number, since it uses less digits than its factorization.

21393883650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177123 (or 177118 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 21393883650 in words is "twenty-one billion, three hundred ninety-three million, eight hundred eighty-three thousand, six hundred fifty".