21001433200000 has 192 divisors, whose sum is σ = 57049259707440. Its totient is φ = 7636883200000.

The previous prime is 21001433199991. The next prime is 21001433200001. The reversal of 21001433200000 is 233410012.

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 (21001433200001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2013474 + ... + 6786526.

Almost surely, 2^{21001433200000} is an apocalyptic number.

21001433200000 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 21001433200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28524629853720).

21001433200000 is an abundant number, since it is smaller than the sum of its proper divisors (36047826507440).

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

21001433200000 is an frugal number, since it uses more digits than its factorization.

21001433200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773103 (or 4773071 counting only the distinct ones).

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

Adding to 21001433200000 its reverse (233410012), we get a palindrome (21001666610012).

The spelling of 21001433200000 in words is "twenty-one trillion, one billion, four hundred thirty-three million, two hundred thousand".