1221001220202 has 128 divisors (see below), whose sum is σ = 2666630799360. Its totient is φ = 371641374720.

The previous prime is 1221001220171. The next prime is 1221001220287. The reversal of 1221001220202 is 2020221001221.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 231203802 + ... + 231209082.

It is an arithmetic number, because the mean of its divisors is an integer number (20833053120).

Almost surely, 2^{1221001220202} is an apocalyptic number.

1221001220202 is an abundant number, since it is smaller than the sum of its proper divisors (1445629579158).

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

1221001220202 is a wasteful number, since it uses less digits than its factorization.

1221001220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6228.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221001220202 its reverse (2020221001221), we get a palindrome (3241222221423).

The spelling of 1221001220202 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twenty thousand, two hundred two".