21227594 has 16 divisors (see below), whose sum is σ = 34878600. Its totient is φ = 9644544.

The previous prime is 21227581. The next prime is 21227599. The reversal of 21227594 is 49572212.

It can be written as a sum of positive squares in 4 ways, for example, as 17749369 + 3478225 = 4213^2 + 1865^2 .

It is a super-2 number, since 2×21227594² = 901221494057672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21227594.

It is not an unprimeable number, because it can be changed into a prime (21227599) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9779 + ... + 11750.

Almost surely, 2^21227594 is an apocalyptic number.

21227594 is a deficient number, since it is larger than the sum of its proper divisors (13651006).

21227594 is a wasteful number, since it uses less digits than its factorization.

21227594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21577.

The product of its digits is 10080, while the sum is 32.

The square root of 21227594 is about 4607.3413157699. The cubic root of 21227594 is about 276.8855283412.

The spelling of 21227594 in words is "twenty-one million, two hundred twenty-seven thousand, five hundred ninety-four".