21225574 has 8 divisors (see below), whose sum is σ = 32578920. Its totient is φ = 10365936.

The previous prime is 21225563. The next prime is 21225583. The reversal of 21225574 is 47552212.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 123319 + ... + 123490.

It is an arithmetic number, because the mean of its divisors is an integer number (4072365).

Almost surely, 2^21225574 is an apocalyptic number.

21225574 is a deficient number, since it is larger than the sum of its proper divisors (11353346).

21225574 is a wasteful number, since it uses less digits than its factorization.

21225574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246854.

The product of its digits is 5600, while the sum is 28.

The square root of 21225574 is about 4607.1220951913. The cubic root of 21225574 is about 276.8767453312.

Adding to 21225574 its reverse (47552212), we get a palindrome (68777786).

The spelling of 21225574 in words is "twenty-one million, two hundred twenty-five thousand, five hundred seventy-four".