21424000340 has 48 divisors (see below), whose sum is σ = 45138280320. Its totient is φ = 8541486720.

The previous prime is 21424000289. The next prime is 21424000399. The reversal of 21424000340 is 4300042412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13232051 + ... + 13233669.

It is an arithmetic number, because the mean of its divisors is an integer number (940380840).

Almost surely, 2^21424000340 is an apocalyptic number.

21424000340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424000340 is an abundant number, since it is smaller than the sum of its proper divisors (23714279980).

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

21424000340 is a wasteful number, since it uses less digits than its factorization.

21424000340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392 (or 3390 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21424000340 its reverse (4300042412), we get a palindrome (25724042752).

The spelling of 21424000340 in words is "twenty-one billion, four hundred twenty-four million, three hundred forty", and thus it is an aban number.