21063450 has 24 divisors (see below), whose sum is σ = 52237728. Its totient is φ = 5616880.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063450 is 5436012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21063451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70062 + ... + 70361.

It is an arithmetic number, because the mean of its divisors is an integer number (2176572).

Almost surely, 2^21063450 is an apocalyptic number.

21063450 is an abundant number, since it is smaller than the sum of its proper divisors (31174278).

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

21063450 is a wasteful number, since it uses less digits than its factorization.

21063450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140438 (or 140433 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21063450 is about 4589.4934360995. The cubic root of 21063450 is about 276.1700013369.

Adding to 21063450 its reverse (5436012), we get a palindrome (26499462).

The spelling of 21063450 in words is "twenty-one million, sixty-three thousand, four hundred fifty".