1221100221002 has 16 divisors (see below), whose sum is σ = 1896968408832. Its totient is φ = 589143345840.

The previous prime is 1221100221001. The next prime is 1221100221007. The reversal of 1221100221002 is 2001220011221.

It is a super-3 number, since 3×1221100221002³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1221100221001) 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, 91475213 + ... + 91488560.

It is an arithmetic number, because the mean of its divisors is an integer number (118560525552).

Almost surely, 2^{1221100221002} is an apocalyptic number.

1221100221002 is a deficient number, since it is larger than the sum of its proper divisors (675868187830).

1221100221002 is a wasteful number, since it uses less digits than its factorization.

1221100221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182963893.

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

Adding to 1221100221002 its reverse (2001220011221), we get a palindrome (3222320232223).

The spelling of 1221100221002 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, two".