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21064242 = 234185627
BaseRepresentation
bin101000001011…
…0101000110010
31110122011201010
41100112220302
520343023432
62031251350
7344020533
oct120265062
943564633
1021064242
1110987971
127079b56
134496964
142b2468a
151cb13cc
hex1416a32

21064242 has 16 divisors (see below), whose sum is σ = 43156512. Its totient is φ = 6850080.

The previous prime is 21064231. The next prime is 21064247. The reversal of 21064242 is 24246012.

It is not an unprimeable number, because it can be changed into a prime (21064247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42568 + ... + 43059.

It is an arithmetic number, because the mean of its divisors is an integer number (2697282).

Almost surely, 221064242 is an apocalyptic number.

21064242 is an abundant number, since it is smaller than the sum of its proper divisors (22092270).

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

21064242 is a wasteful number, since it uses less digits than its factorization.

21064242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85673.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21064242 is about 4589.5797193207. The cubic root of 21064242 is about 276.1734626866.

The spelling of 21064242 in words is "twenty-one million, sixty-four thousand, two hundred forty-two".

Divisors: 1 2 3 6 41 82 123 246 85627 171254 256881 513762 3510707 7021414 10532121 21064242