1221021012200 has 96 divisors (see below), whose sum is σ = 3259950948000. Its totient is φ = 420638803200.

The previous prime is 1221021012151. The next prime is 1221021012217. The reversal of 1221021012200 is 22101201221.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14563715 + ... + 14647314.

It is an arithmetic number, because the mean of its divisors is an integer number (33957822375).

Almost surely, 2^{1221021012200} is an apocalyptic number.

1221021012200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221021012200 is an abundant number, since it is smaller than the sum of its proper divisors (2038929935800).

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

1221021012200 is a wasteful number, since it uses less digits than its factorization.

1221021012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29211075 (or 29211066 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221021012200 its reverse (22101201221), we get a palindrome (1243122213421).

The spelling of 1221021012200 in words is "one trillion, two hundred twenty-one billion, twenty-one million, twelve thousand, two hundred".