1011020101020 has 144 divisors (see below), whose sum is σ = 3095277101280. Its totient is φ = 267100581888.

The previous prime is 1011020100913. The next prime is 1011020101061. The reversal of 1011020101020 is 201010201101.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1011020100993 and 1011020101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51633472 + ... + 51653048.

It is an arithmetic number, because the mean of its divisors is an integer number (21494979870).

Almost surely, 2^{1011020101020} is an apocalyptic number.

1011020101020 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 1011020101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547638550640).

1011020101020 is an abundant number, since it is smaller than the sum of its proper divisors (2084257000260).

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

1011020101020 is a wasteful number, since it uses less digits than its factorization.

1011020101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22244 (or 22239 counting only the distinct ones).

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

Adding to 1011020101020 its reverse (201010201101), we get a palindrome (1212030302121).

The spelling of 1011020101020 in words is "one trillion, eleven billion, twenty million, one hundred one thousand, twenty".