21450522 has 8 divisors (see below), whose sum is σ = 42901056. Its totient is φ = 7150172.

The previous prime is 21450521. The next prime is 21450523. The reversal of 21450522 is 22505412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21450521) and next prime (21450523).

It is a sphenic number, since it is the product of 3 distinct primes.

21450522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21450521) 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 3 ways as a sum of consecutive naturals, for example, 1787538 + ... + 1787549.

It is an arithmetic number, because the mean of its divisors is an integer number (5362632).

Almost surely, 2^21450522 is an apocalyptic number.

21450522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21450522 is a wasteful number, since it uses less digits than its factorization.

21450522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575092.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 21450522 is about 4631.4708246949. The cubic root of 21450522 is about 277.8514206997.

Adding to 21450522 its reverse (22505412), we get a palindrome (43955934).

The spelling of 21450522 in words is "twenty-one million, four hundred fifty thousand, five hundred twenty-two".