1021221222102 has 16 divisors (see below), whose sum is σ = 2269380493680. Its totient is φ = 340407074016.

The previous prime is 1021221222089. The next prime is 1021221222157. The reversal of 1021221222102 is 2012221221201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9455752003 + ... + 9455752110.

It is an arithmetic number, because the mean of its divisors is an integer number (141836280855).

Almost surely, 2^{1021221222102} is an apocalyptic number.

1021221222102 is an abundant number, since it is smaller than the sum of its proper divisors (1248159271578).

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

1021221222102 is a wasteful number, since it uses less digits than its factorization.

1021221222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18911504124 (or 18911504118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021221222102 its reverse (2012221221201), we get a palindrome (3033442443303).

Subtracting 1021221222102 from its reverse (2012221221201), we obtain a palindrome (990999999099).

The spelling of 1021221222102 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred two".