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21203297 = 199531171
BaseRepresentation
bin101000011100…
…0100101100001
31110220020110022
41100320211201
520412001142
62034243225
7345140123
oct120704541
943806408
1021203297
1110a72395
127126515
13451503b
142b5d213
151cdc6d2
hex1438961

21203297 has 8 divisors (see below), whose sum is σ = 22361760. Its totient is φ = 20049120.

The previous prime is 21203293. The next prime is 21203317. The reversal of 21203297 is 79230212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21203297 - 22 = 21203293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203291) 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, 17522 + ... + 18692.

It is an arithmetic number, because the mean of its divisors is an integer number (2795220).

Almost surely, 221203297 is an apocalyptic number.

It is an amenable number.

21203297 is a deficient number, since it is larger than the sum of its proper divisors (1158463).

21203297 is a wasteful number, since it uses less digits than its factorization.

21203297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21203297 is about 4604.7037906906. The cubic root of 21203297 is about 276.7798474043.

The spelling of 21203297 in words is "twenty-one million, two hundred three thousand, two hundred ninety-seven".

Divisors: 1 19 953 1171 18107 22249 1115963 21203297