21413450 has 24 divisors (see below), whose sum is σ = 39958380. Its totient is φ = 8537600.

The previous prime is 21413449. The next prime is 21413459. The reversal of 21413450 is 5431412.

It can be written as a sum of positive squares in 6 ways, for example, as 1100401 + 20313049 = 1049^2 + 4507^2 .

It is not an unprimeable number, because it can be changed into a prime (21413459) 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, 22586 + ... + 23514.

Almost surely, 2^21413450 is an apocalyptic number.

21413450 is a deficient number, since it is larger than the sum of its proper divisors (18544930).

21413450 is a wasteful number, since it uses less digits than its factorization.

21413450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21413450 is about 4627.4669096602. The cubic root of 21413450 is about 277.6912622422.

Adding to 21413450 its reverse (5431412), we get a palindrome (26844862).

The spelling of 21413450 in words is "twenty-one million, four hundred thirteen thousand, four hundred fifty".