12212221000 has 96 divisors (see below), whose sum is σ = 33242297400. Its totient is φ = 4187030400.

The previous prime is 12212220989. The next prime is 12212221039. The reversal of 12212221000 is 12221221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7434923076 + 4777297924 = 86226^2 + 69118^2 .

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 23 ways as a sum of consecutive naturals, for example, 75615 + ... + 173614.

Almost surely, 2^12212221000 is an apocalyptic number.

12212221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212221000 is an abundant number, since it is smaller than the sum of its proper divisors (21030076400).

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

12212221000 is a wasteful number, since it uses less digits than its factorization.

12212221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249264 (or 249243 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12212221000 its reverse (12221221), we get a palindrome (12224442221).

The spelling of 12212221000 in words is "twelve billion, two hundred twelve million, two hundred twenty-one thousand".