1020111102 has 96 divisors (see below), whose sum is σ = 2416677120. Its totient is φ = 309899520.

The previous prime is 1020111091. The next prime is 1020111107. The reversal of 1020111102 is 2011110201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111107) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 1043638 + ... + 1044614.

It is an arithmetic number, because the mean of its divisors is an integer number (25173720).

Almost surely, 2^1020111102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020111102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208338560).

1020111102 is an abundant number, since it is smaller than the sum of its proper divisors (1396566018).

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

1020111102 is a wasteful number, since it uses less digits than its factorization.

1020111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1020111102 is about 31939.1781672603. The cubic root of 1020111102 is about 1006.6592565326.

Adding to 1020111102 its reverse (2011110201), we get a palindrome (3031221303).

Subtracting 1020111102 from its reverse (2011110201), we obtain a palindrome (990999099).

The spelling of 1020111102 in words is "one billion, twenty million, one hundred eleven thousand, one hundred two".