21902185233550 has 48 divisors (see below), whose sum is σ = 41044987193760. Its totient is φ = 8695116909440.

The previous prime is 21902185233527. The next prime is 21902185233553. The reversal of 21902185233550 is 5533258120912.

It is a self number, because there is not a number n which added to its sum of digits gives 21902185233550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21902185233553) 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, 441504 + ... + 6633196.

It is an arithmetic number, because the mean of its divisors is an integer number (855103899870).

Almost surely, 2^{21902185233550} is an apocalyptic number.

21902185233550 is a deficient number, since it is larger than the sum of its proper divisors (19142801960210).

21902185233550 is a wasteful number, since it uses less digits than its factorization.

21902185233550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192237 (or 6192232 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 21902185233550 in words is "twenty-one trillion, nine hundred two billion, one hundred eighty-five million, two hundred thirty-three thousand, five hundred fifty".