1111001221020 has 48 divisors (see below), whose sum is σ = 3112037798688. Its totient is φ = 296149432320.

The previous prime is 1111001221019. The next prime is 1111001221039. The reversal of 1111001221020 is 201221001111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1111001220987 and 1111001221005.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3521229 + ... + 3823748.

It is an arithmetic number, because the mean of its divisors is an integer number (64834120806).

Almost surely, 2^{1111001221020} is an apocalyptic number.

1111001221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111001221020 is an abundant number, since it is smaller than the sum of its proper divisors (2001036577668).

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

1111001221020 is a wasteful number, since it uses less digits than its factorization.

1111001221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347510 (or 7347508 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1111001221020 its reverse (201221001111), we get a palindrome (1312222222131).

The spelling of 1111001221020 in words is "one trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, twenty".