2021230440 has 96 divisors (see below), whose sum is σ = 6619298400. Its totient is φ = 534867840.

The previous prime is 2021230433. The next prime is 2021230493. The reversal of 2021230440 is 440321202.

2021230440 is a `hidden beast` number, since 202 + 1 + 23 + 0 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 25731 + ... + 68589.

It is an arithmetic number, because the mean of its divisors is an integer number (68951025).

Almost surely, 2^2021230440 is an apocalyptic number.

2021230440 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 2021230440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3309649200).

2021230440 is an abundant number, since it is smaller than the sum of its proper divisors (4598067960).

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

2021230440 is a wasteful number, since it uses less digits than its factorization.

2021230440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43007 (or 43000 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2021230440 is about 44958.0964899538. The cubic root of 2021230440 is about 1264.3634806955.

Adding to 2021230440 its reverse (440321202), we get a palindrome (2461551642).

The spelling of 2021230440 in words is "two billion, twenty-one million, two hundred thirty thousand, four hundred forty".