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21161055 = 3511031279
BaseRepresentation
bin101000010111…
…0010001011111
31110211002111210
41100232101133
520404123210
62033315503
7344603016
oct120562137
943732453
1021161055
1110a43683
127105b93
1344cba46
142b4ba7d
151ccee20
hex142e45f

21161055 has 16 divisors (see below), whose sum is σ = 33914880. Its totient is φ = 11266848.

The previous prime is 21161051. The next prime is 21161059. The reversal of 21161055 is 55016112.

It is an interprime number because it is at equal distance from previous prime (21161051) and next prime (21161059).

It is not a de Polignac number, because 21161055 - 22 = 21161051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15906 + ... + 17184.

It is an arithmetic number, because the mean of its divisors is an integer number (2119680).

Almost surely, 221161055 is an apocalyptic number.

21161055 is a deficient number, since it is larger than the sum of its proper divisors (12753825).

21161055 is a wasteful number, since it uses less digits than its factorization.

21161055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 21161055 is about 4600.1146724837. The cubic root of 21161055 is about 276.5959214932.

Adding to 21161055 its reverse (55016112), we get a palindrome (76177167).

The spelling of 21161055 in words is "twenty-one million, one hundred sixty-one thousand, fifty-five".

Divisors: 1 3 5 15 1103 1279 3309 3837 5515 6395 16545 19185 1410737 4232211 7053685 21161055