21343122242 has 16 divisors (see below), whose sum is σ = 34818715512. Its totient is φ = 9753139200.

The previous prime is 21343122223. The next prime is 21343122247. The reversal of 21343122242 is 24222134312.

It can be written as a sum of positive squares in 4 ways, for example, as 21263180761 + 79941481 = 145819^2 + 8941^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21343122247) 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, 4061183 + ... + 4066434.

Almost surely, 2^21343122242 is an apocalyptic number.

21343122242 is a deficient number, since it is larger than the sum of its proper divisors (13475593270).

21343122242 is a wasteful number, since it uses less digits than its factorization.

21343122242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8127733.

The product of its digits is 4608, while the sum is 26.

Adding to 21343122242 its reverse (24222134312), we get a palindrome (45565256554).

The spelling of 21343122242 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-two thousand, two hundred forty-two".