21430539900 has 432 divisors, whose sum is σ = 86555293440. Its totient is φ = 4452624000.

The previous prime is 21430539883. The next prime is 21430539901. The reversal of 21430539900 is 993503412.

It is a happy number.

21430539900 is a `hidden beast` number, since 2 + 1 + 4 + 30 + 539 + 90 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430539901) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2282215 + ... + 2291585.

Almost surely, 2^21430539900 is an apocalyptic number.

21430539900 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 21430539900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43277646720).

21430539900 is an abundant number, since it is smaller than the sum of its proper divisors (65124753540).

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

21430539900 is a wasteful number, since it uses less digits than its factorization.

21430539900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9423 (or 9399 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The spelling of 21430539900 in words is "twenty-one billion, four hundred thirty million, five hundred thirty-nine thousand, nine hundred".