21254450 has 24 divisors (see below), whose sum is σ = 45181632. Its totient is φ = 7287120.

The previous prime is 21254447. The next prime is 21254459. The reversal of 21254450 is 5445212.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21254459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30014 + ... + 30713.

It is an arithmetic number, because the mean of its divisors is an integer number (1882568).

Almost surely, 2^21254450 is an apocalyptic number.

21254450 is an abundant number, since it is smaller than the sum of its proper divisors (23927182).

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

21254450 is a wasteful number, since it uses less digits than its factorization.

21254450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60746 (or 60741 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 21254450 is about 4610.2548736485. The cubic root of 21254450 is about 277.0022459818.

Adding to 21254450 its reverse (5445212), we get a palindrome (26699662).

The spelling of 21254450 in words is "twenty-one million, two hundred fifty-four thousand, four hundred fifty".