21343434311 has 8 divisors (see below), whose sum is σ = 22037028864. Its totient is φ = 20650158360.

The previous prime is 21343434283. The next prime is 21343434317. The reversal of 21343434311 is 11343434312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21343434311 - 2²² = 21339240007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343434317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60446 + ... + 215268.

It is an arithmetic number, because the mean of its divisors is an integer number (2754628608).

Almost surely, 2^21343434311 is an apocalyptic number.

21343434311 is a deficient number, since it is larger than the sum of its proper divisors (693594553).

21343434311 is a wasteful number, since it uses less digits than its factorization.

21343434311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159301.

The product of its digits is 10368, while the sum is 29.

Adding to 21343434311 its reverse (11343434312), we get a palindrome (32686868623).

Subtracting from 21343434311 its reverse (11343434312), we obtain a palindrome (9999999999).

The spelling of 21343434311 in words is "twenty-one billion, three hundred forty-three million, four hundred thirty-four thousand, three hundred eleven".