2001020021120 has 64 divisors (see below), whose sum is σ = 4788616533840. Its totient is φ = 799583447040.

The previous prime is 2001020021101. The next prime is 2001020021177. The reversal of 2001020021120 is 211200201002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2001020021120² (a number of 25 digits) contains 22 as substring.

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, 988547 + ... + 2231426.

Almost surely, 2^{2001020021120} is an apocalyptic number.

2001020021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001020021120 is an abundant number, since it is smaller than the sum of its proper divisors (2787596512720).

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

2001020021120 is an equidigital number, since it uses as much as digits as its factorization.

2001020021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220963 (or 3220951 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001020021120 its reverse (211200201002), we get a palindrome (2212220222122).

The spelling of 2001020021120 in words is "two trillion, one billion, twenty million, twenty-one thousand, one hundred twenty".