1101001021020 has 72 divisors (see below), whose sum is σ = 3389549449104. Its totient is φ = 289218175488.

The previous prime is 1101001020901. The next prime is 1101001021067. The reversal of 1101001021020 is 201201001011.

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 = 1101001020993 and 1101001021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45634749 + ... + 45658868.

It is an arithmetic number, because the mean of its divisors is an integer number (47077075682).

Almost surely, 2^{1101001021020} is an apocalyptic number.

1101001021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101001021020 is an abundant number, since it is smaller than the sum of its proper divisors (2288548428084).

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

1101001021020 is a wasteful number, since it uses less digits than its factorization.

1101001021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91293699 (or 91293694 counting only the distinct ones).

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

Adding to 1101001021020 its reverse (201201001011), we get a palindrome (1302202022031).

The spelling of 1101001021020 in words is "one trillion, one hundred one billion, one million, twenty-one thousand, twenty".