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142221 = 347407
BaseRepresentation
bin100010101110001101
321020002110
4202232031
514022341
63014233
71131432
oct425615
9236073
10142221
1197942
126a379
134c971
1439b89
152c216
hex22b8d

142221 has 4 divisors (see below), whose sum is σ = 189632. Its totient is φ = 94812.

The previous prime is 142217. The next prime is 142223. The reversal of 142221 is 122241.

142221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 142221 - 22 = 142217 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142197 and 142206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142223) 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, 23701 + ... + 23706.

It is an arithmetic number, because the mean of its divisors is an integer number (47408).

2142221 is an apocalyptic number.

It is an amenable number.

142221 is a deficient number, since it is larger than the sum of its proper divisors (47411).

142221 is an equidigital number, since it uses as much as digits as its factorization.

142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47410.

The product of its digits is 32, while the sum is 12.

The square root of 142221 is about 377.1219961763. The cubic root of 142221 is about 52.1980856890.

Adding to 142221 its reverse (122241), we get a palindrome (264462).

It can be divided in two parts, 142 and 221, that added together give a palindrome (363).

The spelling of 142221 in words is "one hundred forty-two thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 3 47407 142221