1221102102 has 16 divisors (see below), whose sum is σ = 2664222912. Its totient is φ = 370030920.

The previous prime is 1221102067. The next prime is 1221102133. The reversal of 1221102102 is 2012011221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9250708 + ... + 9250839.

It is an arithmetic number, because the mean of its divisors is an integer number (166513932).

Almost surely, 2^1221102102 is an apocalyptic number.

1221102102 is an abundant number, since it is smaller than the sum of its proper divisors (1443120810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221102102 is a wasteful number, since it uses less digits than its factorization.

1221102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18501563.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221102102 is about 34944.2713760067. The cubic root of 1221102102 is about 1068.8513897997.

Adding to 1221102102 its reverse (2012011221), we get a palindrome (3233113323).

The spelling of 1221102102 in words is "one billion, two hundred twenty-one million, one hundred two thousand, one hundred two".