Search a number
-
+
21528226 = 222747419
BaseRepresentation
bin101001000011…
…1111010100010
31111111202011201
41102013322202
521002400401
62045231414
7350662336
oct122077242
944452151
1021528226
1111174525
12726256a
1345c9bc5
142c057c6
151d53b01
hex1487ea2

21528226 has 8 divisors (see below), whose sum is σ = 32435280. Its totient is φ = 10716468.

The previous prime is 21528223. The next prime is 21528257. The reversal of 21528226 is 62282512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21528194 and 21528203.

It is not an unprimeable number, because it can be changed into a prime (21528223) 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, 23256 + ... + 24163.

It is an arithmetic number, because the mean of its divisors is an integer number (4054410).

Almost surely, 221528226 is an apocalyptic number.

21528226 is the 2935-th centered pentagonal number.

21528226 is a deficient number, since it is larger than the sum of its proper divisors (10907054).

21528226 is a wasteful number, since it uses less digits than its factorization.

21528226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47648.

The product of its digits is 3840, while the sum is 28.

The square root of 21528226 is about 4639.8519372928. The cubic root of 21528226 is about 278.1865197582.

It can be divided in two parts, 215 and 28226, that added together give a triangular number (28441 = T238).

The spelling of 21528226 in words is "twenty-one million, five hundred twenty-eight thousand, two hundred twenty-six".

Divisors: 1 2 227 454 47419 94838 10764113 21528226