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21331122 = 235367079
BaseRepresentation
bin101000101011…
…1110010110010
31111010201210120
41101113302302
520430043442
62041111110
7346211601
oct121276262
944121716
1021331122
111104a42a
127188496
13455b287
142b93a38
151d154ec
hex1457cb2

21331122 has 16 divisors (see below), whose sum is σ = 43467840. Its totient is φ = 6976112.

The previous prime is 21331109. The next prime is 21331127. The reversal of 21331122 is 22113312.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21331127) 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 7 ways as a sum of consecutive naturals, for example, 33222 + ... + 33857.

It is an arithmetic number, because the mean of its divisors is an integer number (2716740).

Almost surely, 221331122 is an apocalyptic number.

21331122 is an abundant number, since it is smaller than the sum of its proper divisors (22136718).

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

21331122 is a wasteful number, since it uses less digits than its factorization.

21331122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67137.

The product of its digits is 72, while the sum is 15.

The square root of 21331122 is about 4618.5627634579. The cubic root of 21331122 is about 277.3349265785.

Adding to 21331122 its reverse (22113312), we get a palindrome (43444434).

The spelling of 21331122 in words is "twenty-one million, three hundred thirty-one thousand, one hundred twenty-two".

Divisors: 1 2 3 6 53 106 159 318 67079 134158 201237 402474 3555187 7110374 10665561 21331122