21530510140442 has 8 divisors (see below), whose sum is σ = 32414937776832. Its totient is φ = 10725530881500.

The previous prime is 21530510140441. The next prime is 21530510140463. The reversal of 21530510140442 is 24404101503512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21530510140399 and 21530510140408.

It is not an unprimeable number, because it can be changed into a prime (21530510140441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19862093684 + ... + 19862094767.

It is an arithmetic number, because the mean of its divisors is an integer number (4051867222104).

Almost surely, 2^{21530510140442} is an apocalyptic number.

21530510140442 is a deficient number, since it is larger than the sum of its proper divisors (10884427636390).

21530510140442 is a wasteful number, since it uses less digits than its factorization.

21530510140442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39724188724.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21530510140442 its reverse (24404101503512), we get a palindrome (45934611643954).

The spelling of 21530510140442 in words is "twenty-one trillion, five hundred thirty billion, five hundred ten million, one hundred forty thousand, four hundred forty-two".