2021120020 has 48 divisors (see below), whose sum is σ = 4464004608. Its totient is φ = 767594880.

The previous prime is 2021119999. The next prime is 2021120047. The reversal of 2021120020 is 200211202.

It is a super-2 number, since 2×2021120020² = 8169852270489600800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2021119979 and 2021120006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107 + ... + 63613.

It is an arithmetic number, because the mean of its divisors is an integer number (93000096).

Almost surely, 2^2021120020 is an apocalyptic number.

2021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232002304).

2021120020 is an abundant number, since it is smaller than the sum of its proper divisors (2442884588).

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

2021120020 is a wasteful number, since it uses less digits than its factorization.

2021120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61600 (or 61598 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2021120020 is about 44956.8684407622. The cubic root of 2021120020 is about 1264.3404561795.

Adding to 2021120020 its reverse (200211202), we get a palindrome (2221331222).

The spelling of 2021120020 in words is "two billion, twenty-one million, one hundred twenty thousand, twenty".