2001001021020 has 72 divisors (see below), whose sum is σ = 6088850599104. Its totient is φ = 531916975488.

The previous prime is 2001001021001. The next prime is 2001001021031. The reversal of 2001001021020 is 201201001002.

It is a super-2 number, since 2×2001001021020² (a number of 25 digits) contains 22 as substring.

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 = 2001001020993 and 2001001021011.

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, 17477124 + ... + 17591243.

It is an arithmetic number, because the mean of its divisors is an integer number (84567369432).

Almost surely, 2^{2001001021020} is an apocalyptic number.

2001001021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001001021020 is an abundant number, since it is smaller than the sum of its proper divisors (4087849578084).

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

2001001021020 is a wasteful number, since it uses less digits than its factorization.

2001001021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35068699 (or 35068694 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 2001001021020 its reverse (201201001002), we get a palindrome (2202202022022).

The spelling of 2001001021020 in words is "two trillion, one billion, one million, twenty-one thousand, twenty".