21543212858160 has 320 divisors, whose sum is σ = 77294171427840. Its totient is φ = 4861765877760.

The previous prime is 21543212858131. The next prime is 21543212858291. The reversal of 21543212858160 is 6185821234512.

It is a super-2 number, since 2×21543212858160² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 103214064 + ... + 103422576.

It is an arithmetic number, because the mean of its divisors is an integer number (241544285712).

Almost surely, 2^{21543212858160} is an apocalyptic number.

21543212858160 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 21543212858160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38647085713920).

21543212858160 is an abundant number, since it is smaller than the sum of its proper divisors (55750958569680).

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

21543212858160 is a wasteful number, since it uses less digits than its factorization.

21543212858160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209316 (or 209310 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 21543212858160 in words is "twenty-one trillion, five hundred forty-three billion, two hundred twelve million, eight hundred fifty-eight thousand, one hundred sixty".