21335450 has 12 divisors (see below), whose sum is σ = 39684030. Its totient is φ = 8534160.

The previous prime is 21335449. The next prime is 21335453. The reversal of 21335450 is 5453312.

It can be written as a sum of positive squares in 3 ways, for example, as 19704721 + 1630729 = 4439^2 + 1277^2 .

It is not an unprimeable number, because it can be changed into a prime (21335453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213305 + ... + 213404.

Almost surely, 2^21335450 is an apocalyptic number.

21335450 is a deficient number, since it is larger than the sum of its proper divisors (18348580).

21335450 is a wasteful number, since it uses less digits than its factorization.

21335450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426721 (or 426716 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21335450 is about 4619.0312837217. The cubic root of 21335450 is about 277.3536820288.

Adding to 21335450 its reverse (5453312), we get a palindrome (26788762).

The spelling of 21335450 in words is "twenty-one million, three hundred thirty-five thousand, four hundred fifty".