21225054 has 16 divisors (see below), whose sum is σ = 42604560. Its totient is φ = 7049280.

The previous prime is 21225047. The next prime is 21225077. The reversal of 21225054 is 45052212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21225054.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4609 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (2662785).

Almost surely, 2^21225054 is an apocalyptic number.

21225054 is an abundant number, since it is smaller than the sum of its proper divisors (21379506).

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

21225054 is a wasteful number, since it uses less digits than its factorization.

21225054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12875.

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

The square root of 21225054 is about 4607.0656604828. The cubic root of 21225054 is about 276.8744842682.

Adding to 21225054 its reverse (45052212), we get a palindrome (66277266).

The spelling of 21225054 in words is "twenty-one million, two hundred twenty-five thousand, fifty-four".