21343434320 has 40 divisors (see below), whose sum is σ = 53440678536. Its totient is φ = 7880652288.

The previous prime is 21343434317. The next prime is 21343434323. The reversal of 21343434320 is 2343434312.

It is an interprime number because it is at equal distance from previous prime (21343434317) and next prime (21343434323).

It can be written as a sum of positive squares in 4 ways, for example, as 2447083024 + 18896351296 = 49468^2 + 137464^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343434323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10260227 + ... + 10262306.

Almost surely, 2^21343434320 is an apocalyptic number.

21343434320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343434320 is an abundant number, since it is smaller than the sum of its proper divisors (32097244216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343434320 is a wasteful number, since it uses less digits than its factorization.

21343434320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20522559 (or 20522553 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 21343434320 its reverse (2343434312), we get a palindrome (23686868632).

The spelling of 21343434320 in words is "twenty-one billion, three hundred forty-three million, four hundred thirty-four thousand, three hundred twenty".