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21470 = 2519113
BaseRepresentation
bin101001111011110
31002110012
411033132
51141340
6243222
7116411
oct51736
932405
1021470
1115149
1210512
139a07
147b78
156565
hex53de

21470 has 16 divisors (see below), whose sum is σ = 41040. Its totient is φ = 8064.

The previous prime is 21467. The next prime is 21481. The reversal of 21470 is 7412.

It is a happy number.

21470 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between even and odd.

21470 is an undulating number in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21470.

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, 134 + ... + 246.

It is an arithmetic number, because the mean of its divisors is an integer number (2565).

221470 is an apocalyptic number.

21470 is a deficient number, since it is larger than the sum of its proper divisors (19570).

21470 is a wasteful number, since it uses less digits than its factorization.

21470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 21470 is about 146.5264481246. The cubic root of 21470 is about 27.7935495619.

Adding to 21470 its reverse (7412), we get a palindrome (28882).

It can be divided in two parts, 21 and 470, that multiplied together give a triangular number (9870 = T140).

The spelling of 21470 in words is "twenty-one thousand, four hundred seventy", and thus it is an iban number.

Divisors: 1 2 5 10 19 38 95 113 190 226 565 1130 2147 4294 10735 21470