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21393822 = 2329122953
BaseRepresentation
bin101000110011…
…1000110011110
31111020220210210
41101213012132
520434100242
62042313250
7346562442
oct121470636
944226723
1021393822
111109254a
1271b8826
134580988
142bac822
151d28d9c
hex146719e

21393822 has 16 divisors (see below), whose sum is σ = 44263440. Its totient is φ = 6885312.

The previous prime is 21393809. The next prime is 21393847. The reversal of 21393822 is 22839312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21393822.

It is a congruent number.

It is an unprimeable number.

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, 61303 + ... + 61650.

It is an arithmetic number, because the mean of its divisors is an integer number (2766465).

Almost surely, 221393822 is an apocalyptic number.

21393822 is an abundant number, since it is smaller than the sum of its proper divisors (22869618).

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

21393822 is a wasteful number, since it uses less digits than its factorization.

21393822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122987.

The product of its digits is 5184, while the sum is 30.

The square root of 21393822 is about 4625.3456087086. The cubic root of 21393822 is about 277.6063905020.

The spelling of 21393822 in words is "twenty-one million, three hundred ninety-three thousand, eight hundred twenty-two".

Divisors: 1 2 3 6 29 58 87 174 122953 245906 368859 737718 3565637 7131274 10696911 21393822