21444562 has 4 divisors (see below), whose sum is σ = 32166846. Its totient is φ = 10722280.

The previous prime is 21444541. The next prime is 21444581. The reversal of 21444562 is 26544412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21058921 + 385641 = 4589^2 + 621^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21444562.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361139 + ... + 5361142.

Almost surely, 2^21444562 is an apocalyptic number.

21444562 is a deficient number, since it is larger than the sum of its proper divisors (10722284).

21444562 is a wasteful number, since it uses less digits than its factorization.

21444562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722283.

The product of its digits is 7680, while the sum is 28.

The square root of 21444562 is about 4630.8273558836. The cubic root of 21444562 is about 277.8256847624.

Adding to 21444562 its reverse (26544412), we get a palindrome (47988974).

The spelling of 21444562 in words is "twenty-one million, four hundred forty-four thousand, five hundred sixty-two".