21555368159010 has 128 divisors (see below), whose sum is σ = 59520761929728. Its totient is φ = 4893825600000.

The previous prime is 21555368158967. The next prime is 21555368159041. The reversal of 21555368159010 is 1095186355512.

It is a Curzon 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, 389402835 + ... + 389458185.

It is an arithmetic number, because the mean of its divisors is an integer number (465005952576).

Almost surely, 2^{21555368159010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21555368159010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29760380964864).

21555368159010 is an abundant number, since it is smaller than the sum of its proper divisors (37965393770718).

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

21555368159010 is a wasteful number, since it uses less digits than its factorization.

21555368159010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67800.

The product of its (nonzero) digits is 1620000, while the sum is 51.

The spelling of 21555368159010 in words is "twenty-one trillion, five hundred fifty-five billion, three hundred sixty-eight million, one hundred fifty-nine thousand, ten".