Search a number
30223221 = 371937457
BaseRepresentation
bin111001101001…
…0101101110101
32002212111110120
41303102231311
530214120341
62555442153
7514615230
oct163225565
962774416
1030223221
1116073176
12a156359
136352782
14402a417
1529c0066
hex1cd2b75

30223221 has 16 divisors (see below), whose sum is σ = 46299264. Its totient is φ = 17178624.

The previous prime is 30223211. The next prime is 30223261. The reversal of 30223221 is 12232203.

It is not a de Polignac number, because 30223221 - 25 = 30223189 is a prime.

It is a super-2 number, since 2×302232212 = 1826886175229682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30223201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (2893704).

Almost surely, 230223221 is an apocalyptic number.

It is an amenable number.

30223221 is a deficient number, since it is larger than the sum of its proper divisors (16076043).

30223221 is a wasteful number, since it uses less digits than its factorization.

30223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 30223221 is about 5497.5650064369. The cubic root of 30223221 is about 311.4920131894.

Adding to 30223221 its reverse (12232203), we get a palindrome (42455424).

It can be divided in two parts, 302232 and 21, that added together give a triangular number (302253 = T777).

The spelling of 30223221 in words is "thirty million, two hundred twenty-three thousand, two hundred twenty-one".