2021233720 has 64 divisors (see below), whose sum is σ = 4979944800. Its totient is φ = 732218880.

The previous prime is 2021233681. The next prime is 2021233729. The reversal of 2021233720 is 273321202.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 2021233691 and 2021233700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021233729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109822 + ... + 126898.

Almost surely, 2^2021233720 is an apocalyptic number.

2021233720 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 2021233720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2489972400).

2021233720 is an abundant number, since it is smaller than the sum of its proper divisors (2958711080).

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

2021233720 is a wasteful number, since it uses less digits than its factorization.

2021233720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17368 (or 17364 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 2021233720 is about 44958.1329683518. The cubic root of 2021233720 is about 1264.3641646205.

Adding to 2021233720 its reverse (273321202), we get a palindrome (2294554922).

The spelling of 2021233720 in words is "two billion, twenty-one million, two hundred thirty-three thousand, seven hundred twenty".