21203543430 has 192 divisors, whose sum is σ = 60489374400. Its totient is φ = 5132574720.

The previous prime is 21203543363. The next prime is 21203543479. The reversal of 21203543430 is 3434530212.

21203543430 is a `hidden beast` number, since 21 + 203 + 5 + 4 + 3 + 430 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21203543394 and 21203543403.

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 95 ways as a sum of consecutive naturals, for example, 6792270 + ... + 6795390.

It is an arithmetic number, because the mean of its divisors is an integer number (315048825).

Almost surely, 2^21203543430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203543430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30244687200).

21203543430 is an abundant number, since it is smaller than the sum of its proper divisors (39285830970).

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

21203543430 is a wasteful number, since it uses less digits than its factorization.

21203543430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319 (or 3316 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The spelling of 21203543430 in words is "twenty-one billion, two hundred three million, five hundred forty-three thousand, four hundred thirty".