21030751500 has 384 divisors, whose sum is σ = 70366593024. Its totient is φ = 4831200000.

The previous prime is 21030751481. The next prime is 21030751507. The reversal of 21030751500 is 515703012.

It is not an unprimeable number, because it can be changed into a prime (21030751507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 57304317 + ... + 57304683.

It is an arithmetic number, because the mean of its divisors is an integer number (183246336).

Almost surely, 2^21030751500 is an apocalyptic number.

21030751500 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 21030751500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35183296512).

21030751500 is an abundant number, since it is smaller than the sum of its proper divisors (49335841524).

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

21030751500 is a wasteful number, since it uses less digits than its factorization.

21030751500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The spelling of 21030751500 in words is "twenty-one billion, thirty million, seven hundred fifty-one thousand, five hundred".