1221220102 has 16 divisors (see below), whose sum is σ = 1900458000. Its totient is φ = 587855520.

The previous prime is 1221220087. The next prime is 1221220111. The reversal of 1221220102 is 2010221221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9924 + ... + 50407.

It is an arithmetic number, because the mean of its divisors is an integer number (118778625).

Almost surely, 2^1221220102 is an apocalyptic number.

1221220102 is a deficient number, since it is larger than the sum of its proper divisors (679237898).

1221220102 is a wasteful number, since it uses less digits than its factorization.

1221220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60711.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1221220102 is about 34945.9597378581. The cubic root of 1221220102 is about 1068.8858178248.

Adding to 1221220102 its reverse (2010221221), we get a palindrome (3231441323).

The spelling of 1221220102 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred two".