10001001020 has 24 divisors (see below), whose sum is σ = 21005527200. Its totient is φ = 3999748032.

The previous prime is 10001001011. The next prime is 10001001037. The reversal of 10001001020 is 2010010001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 10001000995 and 10001001013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96146 + ... + 171014.

It is an arithmetic number, because the mean of its divisors is an integer number (875230300).

Almost surely, 2^10001001020 is an apocalyptic number.

10001001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001001020 is an abundant number, since it is smaller than the sum of its proper divisors (11004526180).

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

10001001020 is a wasteful number, since it uses less digits than its factorization.

10001001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81557 (or 81555 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10001001020 its reverse (2010010001), we get a palindrome (12011011021).

The spelling of 10001001020 in words is "ten billion, one million, one thousand, twenty".