21343442242 has 8 divisors (see below), whose sum is σ = 32796021132. Its totient is φ = 10411435200.

The previous prime is 21343442209. The next prime is 21343442269. The reversal of 21343442242 is 24224434312.

It can be written as a sum of positive squares in 2 ways, for example, as 17846020921 + 3497421321 = 133589^2 + 59139^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130142859 + ... + 130143022.

Almost surely, 2^21343442242 is an apocalyptic number.

21343442242 is a deficient number, since it is larger than the sum of its proper divisors (11452578890).

21343442242 is a wasteful number, since it uses less digits than its factorization.

21343442242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260285924.

The product of its digits is 36864, while the sum is 31.

Adding to 21343442242 its reverse (24224434312), we get a palindrome (45567876554).

The spelling of 21343442242 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, two hundred forty-two".