2021323572 has 144 divisors (see below), whose sum is σ = 5471024832. Its totient is φ = 652250880.

The previous prime is 2021323571. The next prime is 2021323609. The reversal of 2021323572 is 2753231202.

It is a happy number.

It is a super-3 number, since 3×2021323572³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021323571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4328083 + ... + 4328549.

It is an arithmetic number, because the mean of its divisors is an integer number (37993228).

Almost surely, 2^2021323572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021323572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2735512416).

2021323572 is an abundant number, since it is smaller than the sum of its proper divisors (3449701260).

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

2021323572 is a wasteful number, since it uses less digits than its factorization.

2021323572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 2021323572 is about 44959.1322425155. The cubic root of 2021323572 is about 1264.3828997069.

Adding to 2021323572 its reverse (2753231202), we get a palindrome (4774554774).

The spelling of 2021323572 in words is "two billion, twenty-one million, three hundred twenty-three thousand, five hundred seventy-two".