1221202202102 has 16 divisors (see below), whose sum is σ = 1844042752224. Its totient is φ = 606521760000.

The previous prime is 1221202202053. The next prime is 1221202202123. The reversal of 1221202202102 is 2012022021221.

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, 5465702 + ... + 5684742.

It is an arithmetic number, because the mean of its divisors is an integer number (115252672014).

Almost surely, 2^{1221202202102} is an apocalyptic number.

1221202202102 is a deficient number, since it is larger than the sum of its proper divisors (622840550122).

1221202202102 is a wasteful number, since it uses less digits than its factorization.

1221202202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237655.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221202202102 its reverse (2012022021221), we get a palindrome (3233224223323).

The spelling of 1221202202102 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred two thousand, one hundred two".