21035450 has 24 divisors (see below), whose sum is σ = 39302172. Its totient is φ = 8376320.

The previous prime is 21035449. The next prime is 21035459. The reversal of 21035450 is 5453012.

It can be written as a sum of positive squares in 6 ways, for example, as 8082649 + 12952801 = 2843^2 + 3599^2 .

It is not an unprimeable number, because it can be changed into a prime (21035459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12032 + ... + 13668.

Almost surely, 2^21035450 is an apocalyptic number.

21035450 is a deficient number, since it is larger than the sum of its proper divisors (18266722).

21035450 is a wasteful number, since it uses less digits than its factorization.

21035450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906 (or 1901 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21035450 is about 4586.4419760856. The cubic root of 21035450 is about 276.0475745897.

Adding to 21035450 its reverse (5453012), we get a palindrome (26488462).

The spelling of 21035450 in words is "twenty-one million, thirty-five thousand, four hundred fifty".