21010450 has 48 divisors (see below), whose sum is σ = 41262984. Its totient is φ = 7948800.

The previous prime is 21010441. The next prime is 21010469. The reversal of 21010450 is 5401012.

It can be written as a sum of positive squares in 12 ways, for example, as 6561 + 21003889 = 81^2 + 4583^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21010450.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75712 + ... + 75988.

Almost surely, 2^21010450 is an apocalyptic number.

21010450 is a deficient number, since it is larger than the sum of its proper divisors (20252534).

21010450 is a wasteful number, since it uses less digits than its factorization.

21010450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 21010450 is about 4583.7157416227. The cubic root of 21010450 is about 275.9381731567.

Adding to 21010450 its reverse (5401012), we get a palindrome (26411462).

The spelling of 21010450 in words is "twenty-one million, ten thousand, four hundred fifty".