1221220220102 has 4 divisors (see below), whose sum is σ = 1831830330156. Its totient is φ = 610610110050.

The previous prime is 1221220220083. The next prime is 1221220220131. The reversal of 1221220220102 is 2010220221221.

It is a happy number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 305305055024 + ... + 305305055027.

It is an arithmetic number, because the mean of its divisors is an integer number (457957582539).

Almost surely, 2^{1221220220102} is an apocalyptic number.

1221220220102 is a deficient number, since it is larger than the sum of its proper divisors (610610110054).

1221220220102 is an equidigital number, since it uses as much as digits as its factorization.

1221220220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610610110053.

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

Adding to 1221220220102 its reverse (2010220221221), we get a palindrome (3231440441323).

The spelling of 1221220220102 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, one hundred two".