1101001020 has 48 divisors (see below), whose sum is σ = 3523204608. Its totient is φ = 251657280.

The previous prime is 1101001019. The next prime is 1101001021. The reversal of 1101001020 is 201001011.

It is an interprime number because it is at equal distance from previous prime (1101001019) and next prime (1101001021).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1310296 + ... + 1311135.

It is an arithmetic number, because the mean of its divisors is an integer number (73400096).

Almost surely, 2^1101001020 is an apocalyptic number.

1101001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101001020 is an abundant number, since it is smaller than the sum of its proper divisors (2422203588).

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

1101001020 is a wasteful number, since it uses less digits than its factorization.

1101001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621450 (or 2621448 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1101001020 is about 33181.3354161643. The cubic root of 1101001020 is about 1032.5931517439.

Adding to 1101001020 its reverse (201001011), we get a palindrome (1302002031).

Subtracting from 1101001020 its reverse (201001011), we obtain a palindrome (900000009).

The spelling of 1101001020 in words is "one billion, one hundred one million, one thousand, twenty".