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21384428 = 22132111949
BaseRepresentation
bin101000110010…
…0110011101100
31111020102220212
41101210303230
520433300203
62042201552
7346523162
oct121446354
944212825
1021384428
111108648a
1271b32b8
134579610
142ba9232
151d261d8
hex1464cec

21384428 has 24 divisors (see below), whose sum is σ = 40513200. Its totient is φ = 9817920.

The previous prime is 21384421. The next prime is 21384449. The reversal of 21384428 is 82448312.

It is a junction number, because it is equal to n+sod(n) for n = 21384394 and 21384403.

It is not an unprimeable number, because it can be changed into a prime (21384421) 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, 9998 + ... + 11946.

It is an arithmetic number, because the mean of its divisors is an integer number (1688050).

Almost surely, 221384428 is an apocalyptic number.

It is an amenable number.

21384428 is a deficient number, since it is larger than the sum of its proper divisors (19128772).

21384428 is a wasteful number, since it uses less digits than its factorization.

21384428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2175 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 21384428 is about 4624.3300055251. The cubic root of 21384428 is about 277.5657523491.

It can be divided in two parts, 21384 and 428, that added together give a palindrome (21812).

The spelling of 21384428 in words is "twenty-one million, three hundred eighty-four thousand, four hundred twenty-eight".

Divisors: 1 2 4 13 26 52 211 422 844 1949 2743 3898 5486 7796 10972 25337 50674 101348 411239 822478 1644956 5346107 10692214 21384428