21004203000 has 256 divisors, whose sum is σ = 71686218240. Its totient is φ = 5078016000.

The previous prime is 21004202993. The next prime is 21004203029. The reversal of 21004203000 is 30240012.

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, 17258392 + ... + 17259608.

It is an arithmetic number, because the mean of its divisors is an integer number (280024290).

Almost surely, 2^21004203000 is an apocalyptic number.

21004203000 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 21004203000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35843109120).

21004203000 is an abundant number, since it is smaller than the sum of its proper divisors (50682015240).

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

21004203000 is a wasteful number, since it uses less digits than its factorization.

21004203000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1761 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21004203000 its reverse (30240012), we get a palindrome (21034443012).

The spelling of 21004203000 in words is "twenty-one billion, four million, two hundred three thousand".