21434123320 has 32 divisors (see below), whose sum is σ = 48233743200. Its totient is φ = 8572411008.

The previous prime is 21434123309. The next prime is 21434123357. The reversal of 21434123320 is 2332143412.

It is a congruent number.

It is an unprimeable number.

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, 272626 + ... + 342334.

It is an arithmetic number, because the mean of its divisors is an integer number (1507304475).

Almost surely, 2^21434123320 is an apocalyptic number.

21434123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434123320 is an abundant number, since it is smaller than the sum of its proper divisors (26799619880).

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

21434123320 is a wasteful number, since it uses less digits than its factorization.

21434123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77407 (or 77403 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21434123320 its reverse (2332143412), we get a palindrome (23766266732).

The spelling of 21434123320 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty-three thousand, three hundred twenty".