21450212 has 12 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 9192936.

The previous prime is 21450211. The next prime is 21450229. The reversal of 21450212 is 21205412.

21450212 is an admirable number.

It is a super-2 number, since 2×21450212² = 920223189689888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21450211) 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, 383012 + ... + 383067.

It is an arithmetic number, because the mean of its divisors is an integer number (3575040).

Almost surely, 2^21450212 is an apocalyptic number.

It is an amenable number.

21450212 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.

21450212 is a wasteful number, since it uses less digits than its factorization.

21450212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766090 (or 766088 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21450212 is about 4631.4373578836. The cubic root of 21450212 is about 277.8500822030.

Adding to 21450212 its reverse (21205412), we get a palindrome (42655624).

The spelling of 21450212 in words is "twenty-one million, four hundred fifty thousand, two hundred twelve".