21340404320 has 24 divisors (see below), whose sum is σ = 50416705584. Its totient is φ = 8536161664.

The previous prime is 21340404301. The next prime is 21340404343. The reversal of 21340404320 is 2340404312.

It is a super-3 number, since 3×21340404320³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66688604 + ... + 66688923.

It is an arithmetic number, because the mean of its divisors is an integer number (2100696066).

Almost surely, 2^21340404320 is an apocalyptic number.

21340404320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21340404320 is an abundant number, since it is smaller than the sum of its proper divisors (29076301264).

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

21340404320 is a wasteful number, since it uses less digits than its factorization.

21340404320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133377542 (or 133377534 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21340404320 its reverse (2340404312), we get a palindrome (23680808632).

The spelling of 21340404320 in words is "twenty-one billion, three hundred forty million, four hundred four thousand, three hundred twenty".