1221321202212 has 24 divisors (see below), whose sum is σ = 2849805968800. Its totient is φ = 407098996416.

The previous prime is 1221321202207. The next prime is 1221321202219. The reversal of 1221321202212 is 2122021231221.

It is not an unprimeable number, because it can be changed into a prime (1221321202219) 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, 361762 + ... + 1604217.

Almost surely, 2^{1221321202212} is an apocalyptic number.

1221321202212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221321202212 is an abundant number, since it is smaller than the sum of its proper divisors (1628484766588).

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

1221321202212 is a wasteful number, since it uses less digits than its factorization.

1221321202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017755 (or 2017753 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221321202212 its reverse (2122021231221), we get a palindrome (3343342433433).

The spelling of 1221321202212 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, two hundred two thousand, two hundred twelve".