12221963550 has 36 divisors (see below), whose sum is σ = 32836343280. Its totient is φ = 3259190160.

The previous prime is 12221963489. The next prime is 12221963647. The reversal of 12221963550 is 5536912221.

It is a happy number.

12221963550 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 19 + 635 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13579510 + ... + 13580409.

Almost surely, 2^12221963550 is an apocalyptic number.

12221963550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221963550 is an abundant number, since it is smaller than the sum of its proper divisors (20614379730).

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

12221963550 is a wasteful number, since it uses less digits than its factorization.

12221963550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27159937 (or 27159929 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 12221963550 in words is "twelve billion, two hundred twenty-one million, nine hundred sixty-three thousand, five hundred fifty".