21003303000 has 256 divisors, whose sum is σ = 69448204800. Its totient is φ = 5270054400.

The previous prime is 21003302959. The next prime is 21003303049. The reversal of 21003303000 is 30330012.

It is a happy number.

It is a super-2 number, since 2×21003303000² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8947827 + ... + 8950173.

It is an arithmetic number, because the mean of its divisors is an integer number (271282050).

Almost surely, 2^21003303000 is an apocalyptic number.

21003303000 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 21003303000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34724102400).

21003303000 is an abundant number, since it is smaller than the sum of its proper divisors (48444901800).

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

21003303000 is a wasteful number, since it uses less digits than its factorization.

21003303000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547 (or 2533 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 12.

Adding to 21003303000 its reverse (30330012), we get a palindrome (21033633012).

The spelling of 21003303000 in words is "twenty-one billion, three million, three hundred three thousand".