21542420544430 has 16 divisors (see below), whose sum is σ = 38971213048800. Its totient is φ = 8573666869152.

The previous prime is 21542420544409. The next prime is 21542420544433. The reversal of 21542420544430 is 3444502424512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542420544433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5412666489 + ... + 5412670468.

It is an arithmetic number, because the mean of its divisors is an integer number (2435700815550).

Almost surely, 2^{21542420544430} is an apocalyptic number.

21542420544430 is a deficient number, since it is larger than the sum of its proper divisors (17428792504370).

21542420544430 is a wasteful number, since it uses less digits than its factorization.

21542420544430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825337163.

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 21542420544430 its reverse (3444502424512), we get a palindrome (24986922968942).

The spelling of 21542420544430 in words is "twenty-one trillion, five hundred forty-two billion, four hundred twenty million, five hundred forty-four thousand, four hundred thirty".