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16233221 = 19498329
BaseRepresentation
bin111101111011…
…001100000101
31010112201210102
4331323030011
513123430341
61335533445
7254660114
oct75731405
933481712
1016233221
119188294
12552a285
133494a74
142227c7b
151659c9b
hexf7b305

16233221 has 4 divisors (see below), whose sum is σ = 16243500. Its totient is φ = 16222944.

The previous prime is 16233199. The next prime is 16233247. The reversal of 16233221 is 12233261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7317025 + 8916196 = 2705^2 + 2986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-16233221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16233193 and 16233202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16233271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2216 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (4060875).

It is a self-describing number.

Almost surely, 216233221 is an apocalyptic number.

It is an amenable number.

16233221 is a deficient number, since it is larger than the sum of its proper divisors (10279).

16233221 is an equidigital number, since it uses as much as digits as its factorization.

16233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278.

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

The square root of 16233221 is about 4029.0471578278. The cubic root of 16233221 is about 253.2026424624.

Adding to 16233221 its reverse (12233261), we get a palindrome (28466482).

The spelling of 16233221 in words is "sixteen million, two hundred thirty-three thousand, two hundred twenty-one".

Divisors: 1 1949 8329 16233221