1221000020212 has 12 divisors (see below), whose sum is σ = 2442000040480. Its totient is φ = 523285722936.

The previous prime is 1221000020209. The next prime is 1221000020263. The reversal of 1221000020212 is 2120200001221.

It is a happy number.

1221000020212 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1221000020192 and 1221000020201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21803571762 + ... + 21803571817.

Almost surely, 2^{1221000020212} is an apocalyptic number.

It is an amenable number.

1221000020212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221000020212 is a wasteful number, since it uses less digits than its factorization.

1221000020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43607143590 (or 43607143588 counting only the distinct ones).

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

Adding to 1221000020212 its reverse (2120200001221), we get a palindrome (3341200021433).

The spelling of 1221000020212 in words is "one trillion, two hundred twenty-one billion, twenty thousand, two hundred twelve".