21542430005020 has 48 divisors (see below), whose sum is σ = 45341745624000. Its totient is φ = 8597422632960.

The previous prime is 21542430005011. The next prime is 21542430005027. The reversal of 21542430005020 is 2050003424512.

It is a self number, because there is not a number n which added to its sum of digits gives 21542430005020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542430005027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361244566 + ... + 361304194.

It is an arithmetic number, because the mean of its divisors is an integer number (944619700500).

Almost surely, 2^{21542430005020} is an apocalyptic number.

21542430005020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21542430005020 is an abundant number, since it is smaller than the sum of its proper divisors (23799315618980).

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

21542430005020 is a wasteful number, since it uses less digits than its factorization.

21542430005020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100318 (or 100316 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 21542430005020 its reverse (2050003424512), we get a palindrome (23592433429532).

The spelling of 21542430005020 in words is "twenty-one trillion, five hundred forty-two billion, four hundred thirty million, five thousand, twenty".