21403312000 has 512 divisors, whose sum is σ = 64157184000. Its totient is φ = 6948864000.

The previous prime is 21403311953. The next prime is 21403312013. The reversal of 21403312000 is 21330412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 270927961 + ... + 270928039.

It is an arithmetic number, because the mean of its divisors is an integer number (125307000).

Almost surely, 2^21403312000 is an apocalyptic number.

21403312000 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 21403312000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32078592000).

21403312000 is an abundant number, since it is smaller than the sum of its proper divisors (42753872000).

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

21403312000 is an equidigital number, since it uses as much as digits as its factorization.

21403312000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21403312000 its reverse (21330412), we get a palindrome (21424642412).

The spelling of 21403312000 in words is "twenty-one billion, four hundred three million, three hundred twelve thousand".