12021212221000 has 32 divisors (see below), whose sum is σ = 28129636599480. Its totient is φ = 4808484888000.

The previous prime is 12021212220977. The next prime is 12021212221003. The reversal of 12021212221000 is 12221212021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2706544844964 + 9314667376036 = 1645158^2 + 3051994^2 .

It is not an unprimeable number, because it can be changed into a prime (12021212221003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6010605111 + ... + 6010607110.

Almost surely, 2^{12021212221000} is an apocalyptic number.

12021212221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021212221000 is an abundant number, since it is smaller than the sum of its proper divisors (16108424378480).

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

12021212221000 is a wasteful number, since it uses less digits than its factorization.

12021212221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12021212242 (or 12021212228 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12021212221000 its reverse (12221212021), we get a palindrome (12033433433021).

The spelling of 12021212221000 in words is "twelve trillion, twenty-one billion, two hundred twelve million, two hundred twenty-one thousand".