21042440135430 has 32 divisors (see below), whose sum is σ = 57716407229184. Its totient is φ = 4809700602336.

The previous prime is 21042440135429. The next prime is 21042440135467. The reversal of 21042440135430 is 3453104424012.

It is a junction number, because it is equal to n+sod(n) for n = 21042440135391 and 21042440135400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50101047732 + ... + 50101048151.

It is an arithmetic number, because the mean of its divisors is an integer number (1803637725912).

Almost surely, 2^{21042440135430} is an apocalyptic number.

21042440135430 is an abundant number, since it is smaller than the sum of its proper divisors (36673967093754).

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

21042440135430 is a wasteful number, since it uses less digits than its factorization.

21042440135430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100202095900.

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 21042440135430 its reverse (3453104424012), we get a palindrome (24495544559442).

The spelling of 21042440135430 in words is "twenty-one trillion, forty-two billion, four hundred forty million, one hundred thirty-five thousand, four hundred thirty".