1221021220102 has 8 divisors (see below), whose sum is σ = 1833154093800. Its totient is φ = 609969855504.

The previous prime is 1221021220091. The next prime is 1221021220157. The reversal of 1221021220102 is 2010221201221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 270374452 + ... + 270378967.

It is an arithmetic number, because the mean of its divisors is an integer number (229144261725).

Almost surely, 2^{1221021220102} is an apocalyptic number.

1221021220102 is a deficient number, since it is larger than the sum of its proper divisors (612132873698).

1221021220102 is a wasteful number, since it uses less digits than its factorization.

1221021220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540754550.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221021220102 its reverse (2010221201221), we get a palindrome (3231242421323).

The spelling of 1221021220102 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred two".