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21122018 = 267157627
BaseRepresentation
bin101000010010…
…0101111100010
31110202002221222
41100210233202
520401401033
62032415042
7344351141
oct120445742
943662858
1021122018
1110a17315
1270a7482
1344b7048
142b3b758
151cc3598
hex1424be2

21122018 has 8 divisors (see below), whose sum is σ = 32156112. Its totient is φ = 10403316.

The previous prime is 21122009. The next prime is 21122033. The reversal of 21122018 is 81022112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211220182 = 892279288784648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121987 and 21122005.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 78680 + ... + 78947.

It is an arithmetic number, because the mean of its divisors is an integer number (4019514).

Almost surely, 221122018 is an apocalyptic number.

21122018 is a deficient number, since it is larger than the sum of its proper divisors (11034094).

21122018 is a wasteful number, since it uses less digits than its factorization.

21122018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157696.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 21122018 is about 4595.8696674297. The cubic root of 21122018 is about 276.4257327295.

The spelling of 21122018 in words is "twenty-one million, one hundred twenty-two thousand, eighteen".

Divisors: 1 2 67 134 157627 315254 10561009 21122018