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18132021 = 325573617
BaseRepresentation
bin100010100101…
…0110000110101
31021010012110100
41011022300311
514120211041
61444344313
7310056015
oct105126065
937105410
1018132021
11a264946
1260a5099
1339ab10b
14259dc45
1518d26b6
hex114ac35

18132021 has 12 divisors (see below), whose sum is σ = 26244972. Its totient is φ = 12062976.

The previous prime is 18132019. The next prime is 18132029. The reversal of 18132021 is 12023181.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 17514225 = 786^2 + 4185^2 .

It is not a de Polignac number, because 18132021 - 21 = 18132019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18131985 and 18132003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18132029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3205 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (2187081).

Almost surely, 218132021 is an apocalyptic number.

It is an amenable number.

18132021 is a deficient number, since it is larger than the sum of its proper divisors (8112951).

18132021 is a wasteful number, since it uses less digits than its factorization.

18132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180 (or 4177 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18132021 is about 4258.1710862764. The cubic root of 18132021 is about 262.7133068925.

The spelling of 18132021 in words is "eighteen million, one hundred thirty-two thousand, twenty-one".

Divisors: 1 3 9 557 1671 3617 5013 10851 32553 2014669 6044007 18132021