21203000440 has 64 divisors (see below), whose sum is σ = 51080738400. Its totient is φ = 7892594688.

The previous prime is 21203000417. The next prime is 21203000461. The reversal of 21203000440 is 4400030212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114654 + ... + 235693.

Almost surely, 2^21203000440 is an apocalyptic number.

21203000440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203000440 is an abundant number, since it is smaller than the sum of its proper divisors (29877737960).

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

21203000440 is a wasteful number, since it uses less digits than its factorization.

21203000440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350464 (or 350460 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21203000440 its reverse (4400030212), we get a palindrome (25603030652).

The spelling of 21203000440 in words is "twenty-one billion, two hundred three million, four hundred forty", and thus it is an aban number.