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21204470 = 257302921
BaseRepresentation
bin101000011100…
…0110111110110
31110220022001202
41100320313312
520412020340
62034252502
7345143420
oct120706766
943808052
1021204470
1110a73261
127127132
134515731
142b5d810
151cdcc15
hex1438df6

21204470 has 16 divisors (see below), whose sum is σ = 43620768. Its totient is φ = 7270080.

The previous prime is 21204451. The next prime is 21204487. The reversal of 21204470 is 7440212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151391 + ... + 151530.

It is an arithmetic number, because the mean of its divisors is an integer number (2726298).

Almost surely, 221204470 is an apocalyptic number.

21204470 is an abundant number, since it is smaller than the sum of its proper divisors (22416298).

21204470 is a wasteful number, since it uses less digits than its factorization.

21204470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302935.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 21204470 is about 4604.8311586854. The cubic root of 21204470 is about 276.7849512768.

Adding to 21204470 its reverse (7440212), we get a palindrome (28644682).

It can be divided in two parts, 21204 and 470, that multiplied together give a triangular number (9965880 = T4464).

The spelling of 21204470 in words is "twenty-one million, two hundred four thousand, four hundred seventy".

Divisors: 1 2 5 7 10 14 35 70 302921 605842 1514605 2120447 3029210 4240894 10602235 21204470