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BaseRepresentation
bin110001101011…
…011111110101
3220111122111112
4301223133311
511313220341
61143044405
7215460401
oct61533765
926448445
1013023221
1173955a2
124440705
13290c963
141a30101
151223aeb
hexc6b7f5

13023221 has 4 divisors (see below), whose sum is σ = 13589472. Its totient is φ = 12456972.

The previous prime is 13023203. The next prime is 13023251. The reversal of 13023221 is 12232031.

Adding to 13023221 its reverse (12232031), we get a palindrome (25255252).

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12232031 = 71747433.

It is a cyclic number.

It is not a de Polignac number, because 13023221 - 214 = 13006837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13023196 and 13023205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13023251) 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, 283091 + ... + 283136.

It is an arithmetic number, because the mean of its divisors is an integer number (3397368).

Almost surely, 213023221 is an apocalyptic number.

It is an amenable number.

13023221 is a deficient number, since it is larger than the sum of its proper divisors (566251).

13023221 is an equidigital number, since it uses as much as digits as its factorization.

13023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566250.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13023221 is about 3608.7700120678. The cubic root of 13023221 is about 235.2733863757.

The spelling of 13023221 in words is "thirteen million, twenty-three thousand, two hundred twenty-one".

Divisors: 1 23 566227 13023221