21213554543500 has 192 divisors, whose sum is σ = 51657760627200. Its totient is φ = 7545607200000.

The previous prime is 21213554543491. The next prime is 21213554543569. The reversal of 21213554543500 is 534545531212.

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 63 ways as a sum of consecutive naturals, for example, 45876451 + ... + 46336549.

It is an arithmetic number, because the mean of its divisors is an integer number (269050836600).

Almost surely, 2^{21213554543500} is an apocalyptic number.

21213554543500 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 21213554543500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25828880313600).

21213554543500 is an abundant number, since it is smaller than the sum of its proper divisors (30444206083700).

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

21213554543500 is a wasteful number, since it uses less digits than its factorization.

21213554543500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460313 (or 460301 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 21213554543500 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, five hundred forty-three thousand, five hundred".