4000021500 has 192 divisors, whose sum is σ = 12029576832. Its totient is φ = 1032192000.

The previous prime is 4000021463. The next prime is 4000021507. The reversal of 4000021500 is 51200004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000021507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11869332 + ... + 11869668.

It is an arithmetic number, because the mean of its divisors is an integer number (62654046).

Almost surely, 2^4000021500 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 4000021500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6014788416).

4000021500 is an abundant number, since it is smaller than the sum of its proper divisors (8029555332).

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

4000021500 is a wasteful number, since it uses less digits than its factorization.

4000021500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 4000021500 is about 63245.7231755634. The cubic root of 4000021500 is about 1587.4038960567.

Adding to 4000021500 its reverse (51200004), we get a palindrome (4051221504).

The spelling of 4000021500 in words is "four billion, twenty-one thousand, five hundred".