1221210202102 has 16 divisors (see below), whose sum is σ = 2007147252672. Its totient is φ = 552650189320.

The previous prime is 1221210202081. The next prime is 1221210202117. The reversal of 1221210202102 is 2012020121221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122262748 + ... + 122272735.

It is an arithmetic number, because the mean of its divisors is an integer number (125446703292).

Almost surely, 2^{1221210202102} is an apocalyptic number.

1221210202102 is a deficient number, since it is larger than the sum of its proper divisors (785937050570).

1221210202102 is a wasteful number, since it uses less digits than its factorization.

1221210202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244535723.

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

Adding to 1221210202102 its reverse (2012020121221), we get a palindrome (3233230323323).

The spelling of 1221210202102 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, one hundred two".