1020121011100 has 144 divisors (see below), whose sum is σ = 2353443307488. Its totient is φ = 382482063360.

The previous prime is 1020121011067. The next prime is 1020121011109. The reversal of 1020121011100 is 11101210201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121011109) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 581927824 + ... + 581929576.

It is an arithmetic number, because the mean of its divisors is an integer number (16343356302).

Almost surely, 2^{1020121011100} is an apocalyptic number.

1020121011100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020121011100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176721653744).

1020121011100 is an abundant number, since it is smaller than the sum of its proper divisors (1333322296388).

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

1020121011100 is a wasteful number, since it uses less digits than its factorization.

1020121011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984 (or 2977 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1020121011100 its reverse (11101210201), we get a palindrome (1031222221301).

The spelling of 1020121011100 in words is "one trillion, twenty billion, one hundred twenty-one million, eleven thousand, one hundred".