21022450 has 24 divisors (see below), whose sum is σ = 39844548. Its totient is φ = 8249280.

The previous prime is 21022447. The next prime is 21022451. The reversal of 21022450 is 5422012.

It can be written as a sum of positive squares in 6 ways, for example, as 7634169 + 13388281 = 2763^2 + 3659^2 .

It is not an unprimeable number, because it can be changed into a prime (21022451) 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, 1317 + ... + 6616.

Almost surely, 2^21022450 is an apocalyptic number.

21022450 is a deficient number, since it is larger than the sum of its proper divisors (18822098).

21022450 is a wasteful number, since it uses less digits than its factorization.

21022450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998 (or 7993 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21022450 is about 4585.0245364665. The cubic root of 21022450 is about 275.9906966688.

Adding to 21022450 its reverse (5422012), we get a palindrome (26444462).

It can be divided in two parts, 2 and 1022450, that multiplied together give a square (2044900 = 1430²).

The spelling of 21022450 in words is "twenty-one million, twenty-two thousand, four hundred fifty".