21200450 has 24 divisors (see below), whose sum is σ = 40795380. Its totient is φ = 8187200.

The previous prime is 21200401. The next prime is 21200461. The reversal of 21200450 is 5400212.

It can be written as a sum of positive squares in 6 ways, for example, as 1495729 + 19704721 = 1223^2 + 4439^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5861 + ... + 8760.

Almost surely, 2^21200450 is an apocalyptic number.

21200450 is a deficient number, since it is larger than the sum of its proper divisors (19594930).

21200450 is a wasteful number, since it uses less digits than its factorization.

21200450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14662 (or 14657 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 21200450 is about 4604.3946399065. The cubic root of 21200450 is about 276.7674589615.

Adding to 21200450 its reverse (5400212), we get a palindrome (26600662).

The spelling of 21200450 in words is "twenty-one million, two hundred thousand, four hundred fifty".