Search a number
-
+
21055400160 = 2535834431193
BaseRepresentation
bin10011100110111111…
…111110100011100000
32000100101110011002120
4103212333332203200
5321110140301120
613401150144240
71343525643204
oct234677764340
960311404076
1021055400160
118a25251863
1240b74b2080
131ca7241182
14103a534b04
15833742140
hex4e6ffe8e0

21055400160 has 192 divisors, whose sum is σ = 67331513088. Its totient is φ = 5529964544.

The previous prime is 21055400143. The next prime is 21055400173. The reversal of 21055400160 is 6100455012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21055400160.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17648524 + ... + 17649716.

It is an arithmetic number, because the mean of its divisors is an integer number (350684964).

Almost surely, 221055400160 is an apocalyptic number.

21055400160 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 21055400160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33665756544).

21055400160 is an abundant number, since it is smaller than the sum of its proper divisors (46276112928).

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

21055400160 is a wasteful number, since it uses less digits than its factorization.

21055400160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21055400160 its reverse (6100455012), we get a palindrome (27155855172).

The spelling of 21055400160 in words is "twenty-one billion, fifty-five million, four hundred thousand, one hundred sixty".