12217289550 has 48 divisors (see below), whose sum is σ = 30318444912. Its totient is φ = 3255840000.

The previous prime is 12217289549. The next prime is 12217289561. The reversal of 12217289550 is 5598271221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214050 + ... + 265050.

It is an arithmetic number, because the mean of its divisors is an integer number (631634269).

Almost surely, 2^12217289550 is an apocalyptic number.

12217289550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12217289550 is an abundant number, since it is smaller than the sum of its proper divisors (18101155362).

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

12217289550 is a wasteful number, since it uses less digits than its factorization.

12217289550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52613 (or 52608 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 12217289550 in words is "twelve billion, two hundred seventeen million, two hundred eighty-nine thousand, five hundred fifty".