1221221102102 has 4 divisors (see below), whose sum is σ = 1831831653156. Its totient is φ = 610610551050.

The previous prime is 1221221102083. The next prime is 1221221102117. The reversal of 1221221102102 is 2012011221221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305305275524 + ... + 305305275527.

It is an arithmetic number, because the mean of its divisors is an integer number (457957913289).

Almost surely, 2^{1221221102102} is an apocalyptic number.

1221221102102 is a deficient number, since it is larger than the sum of its proper divisors (610610551054).

1221221102102 is an equidigital number, since it uses as much as digits as its factorization.

1221221102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610610551053.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221221102102 its reverse (2012011221221), we get a palindrome (3233232323323).

The spelling of 1221221102102 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred two".