2021243400 has 576 divisors, whose sum is σ = 7938777600. Its totient is φ = 456192000.

The previous prime is 2021243387. The next prime is 2021243401. The reversal of 2021243400 is 43421202.

2021243400 is a `hidden beast` number, since 2 + 0 + 21 + 243 + 400 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2021243401) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 22710556 + ... + 22710644.

It is an arithmetic number, because the mean of its divisors is an integer number (13782600).

Almost surely, 2^2021243400 is an apocalyptic number.

2021243400 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 2021243400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3969388800).

2021243400 is an abundant number, since it is smaller than the sum of its proper divisors (5917534200).

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

2021243400 is a wasteful number, since it uses less digits than its factorization.

2021243400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 178 counting only the distinct ones).

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

The square root of 2021243400 is about 44958.2406239390. The cubic root of 2021243400 is about 1264.3661830289.

Adding to 2021243400 its reverse (43421202), we get a palindrome (2064664602).

The spelling of 2021243400 in words is "two billion, twenty-one million, two hundred forty-three thousand, four hundred".