21403312000000 has 1232 divisors, whose sum is σ = 64479674649600. Its totient is φ = 6948864000000.

The previous prime is 21403311999973. The next prime is 21403312000003. The reversal of 21403312000000 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 not an unprimeable number, because it can be changed into a prime (21403312000003) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 270927999961 + ... + 270928000039.

Almost surely, 2^{21403312000000} is an apocalyptic number.

21403312000000 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 21403312000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32239837324800).

21403312000000 is an abundant number, since it is smaller than the sum of its proper divisors (43076362649600).

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

21403312000000 is an frugal number, since it uses more digits than its factorization.

21403312000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 193 counting only the distinct ones).

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

Adding to 21403312000000 its reverse (21330412), we get a palindrome (21403333330412).

The spelling of 21403312000000 in words is "twenty-one trillion, four hundred three billion, three hundred twelve million", and thus it is an aban number.