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21150423 = 337472381
BaseRepresentation
bin101000010101…
…1101011010111
31110210112221000
41100223223113
520403303143
62033154343
7344530020
oct120535327
943715830
1021150423
1110a36698
1270bb9b3
1344c6c58
142b47c47
151ccbbd3
hex142bad7

21150423 has 32 divisors (see below), whose sum is σ = 36587520. Its totient is φ = 11823840.

The previous prime is 21150407. The next prime is 21150443. The reversal of 21150423 is 32405112.

It is not a de Polignac number, because 21150423 - 24 = 21150407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21150396 and 21150405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7693 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (1143360).

Almost surely, 221150423 is an apocalyptic number.

21150423 is a deficient number, since it is larger than the sum of its proper divisors (15437097).

21150423 is a wasteful number, since it uses less digits than its factorization.

21150423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21150423 is about 4598.9589039260. The cubic root of 21150423 is about 276.5495901472.

Adding to 21150423 its reverse (32405112), we get a palindrome (53555535).

The spelling of 21150423 in words is "twenty-one million, one hundred fifty thousand, four hundred twenty-three".

Divisors: 1 3 7 9 21 27 47 63 141 189 329 423 987 1269 2381 2961 7143 8883 16667 21429 50001 64287 111907 150003 335721 450009 783349 1007163 2350047 3021489 7050141 21150423