21343501800 has 576 divisors, whose sum is σ = 78726211200. Its totient is φ = 5163264000.

The previous prime is 21343501783. The next prime is 21343501813. The reversal of 21343501800 is 810534312.

It is a happy number.

21343501800 is a `hidden beast` number, since 2 + 134 + 350 + 180 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 127805317 + ... + 127805483.

It is an arithmetic number, because the mean of its divisors is an integer number (136677450).

Almost surely, 2^21343501800 is an apocalyptic number.

21343501800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343501800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39363105600).

21343501800 is an abundant number, since it is smaller than the sum of its proper divisors (57382709400).

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

21343501800 is a wasteful number, since it uses less digits than its factorization.

21343501800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21343501800 in words is "twenty-one billion, three hundred forty-three million, five hundred one thousand, eight hundred".