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21451238808120 = 233251123131234187
BaseRepresentation
bin1001110000010100000010…
…11110000001101000111000
32210221201101201022110000200
410320022001132001220320
510302424114113324440
6113342321342202200
74342541460245112
oct470120136015070
983851351273020
1021451238808120
116920468090240
1224a5488583360
13bc7ac64bbc84
1454236190a3b2
15272ee14dec30
hex138281781a38

21451238808120 has 192 divisors, whose sum is σ = 76058004896640. Its totient is φ = 5200053292800.

The previous prime is 21451238808059. The next prime is 21451238808161. The reversal of 21451238808120 is 2180883215412.

21451238808120 is a `hidden beast` number, since 2 + 1 + 4 + 512 + 3 + 8 + 8 + 0 + 8 + 120 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91481667 + ... + 91715853.

It is an arithmetic number, because the mean of its divisors is an integer number (396135442170).

Almost surely, 221451238808120 is an apocalyptic number.

21451238808120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21451238808120 is an abundant number, since it is smaller than the sum of its proper divisors (54606766088520).

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

21451238808120 is a wasteful number, since it uses less digits than its factorization.

21451238808120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257346 (or 257339 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 21451238808120 in words is "twenty-one trillion, four hundred fifty-one billion, two hundred thirty-eight million, eight hundred eight thousand, one hundred twenty".