21474 has 12 divisors (see below), whose sum is σ = 46566. Its totient is φ = 7152.

The previous prime is 21467. The next prime is 21481. The reversal of 21474 is 47412.

It is a happy number.

21474 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21467) and next prime (21481).

It can be written as a sum of positive squares in only one way, i.e., 18225 + 3249 = 135^2 + 57^2 .

It is a super-2 number, since 2×21474² = 922265352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1193 = 21474 / (2 + 1 + 4 + 7 + 4).

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21474.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 579 + ... + 614.

2²¹⁴⁷⁴ is an apocalyptic number.

21474 is an abundant number, since it is smaller than the sum of its proper divisors (25092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21474 is a wasteful number, since it uses less digits than its factorization.

21474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201 (or 1198 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 21474 is about 146.5400969018. The cubic root of 21474 is about 27.7952754941.

Adding to 21474 its reverse (47412), we get a palindrome (68886).

The spelling of 21474 in words is "twenty-one thousand, four hundred seventy-four", and thus it is an iban number.