21555671347000 has 256 divisors, whose sum is σ = 59636056596480. Its totient is φ = 7136429184000.

The previous prime is 21555671346947. The next prime is 21555671347103. The reversal of 21555671347000 is 74317655512.

It is a congruent number.

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, 99060319 + ... + 99277681.

It is an arithmetic number, because the mean of its divisors is an integer number (232953346080).

Almost surely, 2^{21555671347000} is an apocalyptic number.

21555671347000 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 21555671347000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29818028298240).

21555671347000 is an abundant number, since it is smaller than the sum of its proper divisors (38080385249480).

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

21555671347000 is a wasteful number, since it uses less digits than its factorization.

21555671347000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217879 (or 217865 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 21555671347000 in words is "twenty-one trillion, five hundred fifty-five billion, six hundred seventy-one million, three hundred forty-seven thousand".