21352343213242 has 8 divisors (see below), whose sum is σ = 32028535004436. Its totient is φ = 10676164878432.

The previous prime is 21352343213239. The next prime is 21352343213249. The reversal of 21352343213242 is 24231234325312.

It can be written as a sum of positive squares in 2 ways, for example, as 18957150548361 + 2395192664881 = 4353981^2 + 1547641^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21352343213249) 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, 3044638 + ... + 7209334.

Almost surely, 2^{21352343213242} is an apocalyptic number.

21352343213242 is a deficient number, since it is larger than the sum of its proper divisors (10676191791194).

21352343213242 is a wasteful number, since it uses less digits than its factorization.

21352343213242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6728192.

The product of its digits is 207360, while the sum is 37.

Adding to 21352343213242 its reverse (24231234325312), we get a palindrome (45583577538554).

The spelling of 21352343213242 in words is "twenty-one trillion, three hundred fifty-two billion, three hundred forty-three million, two hundred thirteen thousand, two hundred forty-two".