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21233216 = 26331769
BaseRepresentation
bin101000011111…
…1111001000000
31110221202111102
41100333321000
520413430331
62035033532
7345323264
oct120777100
943852442
1021233216
1110a92914
12713b8a8
134525844
142b6a0a4
151ce64cb
hex143fe40

21233216 has 14 divisors (see below), whose sum is σ = 42134790. Its totient is φ = 10616576.

The previous prime is 21233213. The next prime is 21233239. The reversal of 21233216 is 61233212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 802816 = 4520^2 + 896^2 .

It is not an unprimeable number, because it can be changed into a prime (21233213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165821 + ... + 165948.

It is a self-describing number.

Almost surely, 221233216 is an apocalyptic number.

It is an amenable number.

21233216 is a deficient number, since it is larger than the sum of its proper divisors (20901574).

21233216 is an equidigital number, since it uses as much as digits as its factorization.

21233216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331781 (or 331771 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 21233216 is about 4607.9513886325. The cubic root of 21233216 is about 276.9099700033.

Adding to 21233216 its reverse (61233212), we get a palindrome (82466428).

The spelling of 21233216 in words is "twenty-one million, two hundred thirty-three thousand, two hundred sixteen".

Divisors: 1 2 4 8 16 32 64 331769 663538 1327076 2654152 5308304 10616608 21233216